Use `(r)find_char` instead of `(r)find` for single characters

70 files changed, 169 insertions, 169 deletions

diff --git a/core/config/project_settings.cpp b/core/config/project_settings.cpp
index fa0e4037ba..9b2efd89e1 100644
--- a/core/config/project_settings.cpp
+++ b/core/config/project_settings.cpp
@@ -194,7 +194,7 @@ String ProjectSettings::localize_path(const String &p_path) const {
 
 		return cwd.replace_first(res_path, "res://");
 	} else {
-		int sep = path.rfind("/");
+		int sep = path.rfind_char('/');
 		if (sep == -1) {
 			return "res://" + path;
 		}
@@ -300,7 +300,7 @@ bool ProjectSettings::_set(const StringName &p_name, const Variant &p_value) {
 		}
 
 		{ // Feature overrides.
-			int dot = p_name.operator String().find(".");
+			int dot = p_name.operator String().find_char('.');
 			if (dot != -1) {
 				Vector<String> s = p_name.operator String().split(".");
 
@@ -435,7 +435,7 @@ void ProjectSettings::_get_property_list(List<PropertyInfo> *p_list) const {
 
 	for (const _VCSort &E : vclist) {
 		String prop_info_name = E.name;
-		int dot = prop_info_name.find(".");
+		int dot = prop_info_name.find_char('.');
 		if (dot != -1 && !custom_prop_info.has(prop_info_name)) {
 			prop_info_name = prop_info_name.substr(0, dot);
 		}
@@ -1092,7 +1092,7 @@ Error ProjectSettings::save_custom(const String &p_path, const CustomMap &p_cust
 		String category = E.name;
 		String name = E.name;
 
-		int div = category.find("/");
+		int div = category.find_char('/');
 
 		if (div < 0) {
 			category = "";
diff --git a/core/debugger/engine_debugger.cpp b/core/debugger/engine_debugger.cpp
index 6d2868cef2..a9f87ad825 100644
--- a/core/debugger/engine_debugger.cpp
+++ b/core/debugger/engine_debugger.cpp
@@ -163,7 +163,7 @@ void EngineDebugger::initialize(const String &p_uri, bool p_skip_breakpoints, co
 
 	for (int i = 0; i < p_breakpoints.size(); i++) {
 		const String &bp = p_breakpoints[i];
-		int sp = bp.rfind(":");
+		int sp = bp.rfind_char(':');
 		ERR_CONTINUE_MSG(sp == -1, vformat("Invalid breakpoint: '%s', expected file:line format.", bp));
 
 		singleton_script_debugger->insert_breakpoint(bp.substr(sp + 1, bp.length()).to_int(), bp.substr(0, sp));
diff --git a/core/debugger/local_debugger.cpp b/core/debugger/local_debugger.cpp
index 5e79a6d395..a5d807f66b 100644
--- a/core/debugger/local_debugger.cpp
+++ b/core/debugger/local_debugger.cpp
@@ -171,7 +171,7 @@ void LocalDebugger::debug(bool p_can_continue, bool p_is_error_breakpoint) {
 
 			} else {
 				String key_value = line.get_slicec(' ', 1);
-				int value_pos = key_value.find("=");
+				int value_pos = key_value.find_char('=');
 
 				if (value_pos < 0) {
 					print_line("Error: Invalid set format. Use: set key=value");
@@ -344,7 +344,7 @@ Pair<String, int> LocalDebugger::to_breakpoint(const String &p_line) {
 	String breakpoint_part = p_line.get_slicec(' ', 1);
 	Pair<String, int> breakpoint;
 
-	int last_colon = breakpoint_part.rfind(":");
+	int last_colon = breakpoint_part.rfind_char(':');
 	if (last_colon < 0) {
 		print_line("Error: Invalid breakpoint format. Expected [source:line]");
 		return breakpoint;
diff --git a/core/debugger/remote_debugger.cpp b/core/debugger/remote_debugger.cpp
index a02354b377..f8e42e6d92 100644
--- a/core/debugger/remote_debugger.cpp
+++ b/core/debugger/remote_debugger.cpp
@@ -338,7 +338,7 @@ void RemoteDebugger::_send_stack_vars(List<String> &p_names, List<Variant> &p_va
 }
 
 Error RemoteDebugger::_try_capture(const String &p_msg, const Array &p_data, bool &r_captured) {
-	const int idx = p_msg.find(":");
+	const int idx = p_msg.find_char(':');
 	r_captured = false;
 	if (idx < 0) { // No prefix, unknown message.
 		return OK;
@@ -610,7 +610,7 @@ void RemoteDebugger::poll_events(bool p_is_idle) {
 		ERR_CONTINUE(arr[1].get_type() != Variant::ARRAY);
 
 		const String cmd = arr[0];
-		const int idx = cmd.find(":");
+		const int idx = cmd.find_char(':');
 		bool parsed = false;
 		if (idx < 0) { // Not prefix, use scripts capture.
 			capture_parse("core", cmd, arr[1], parsed);
diff --git a/core/debugger/remote_debugger_peer.cpp b/core/debugger/remote_debugger_peer.cpp
index 793db7330f..d38fbc8d91 100644
--- a/core/debugger/remote_debugger_peer.cpp
+++ b/core/debugger/remote_debugger_peer.cpp
@@ -224,7 +224,7 @@ RemoteDebuggerPeer *RemoteDebuggerPeerTCP::create(const String &p_uri) {
 	uint16_t debug_port = 6007;
 
 	if (debug_host.contains(":")) {
-		int sep_pos = debug_host.rfind(":");
+		int sep_pos = debug_host.rfind_char(':');
 		debug_port = debug_host.substr(sep_pos + 1).to_int();
 		debug_host = debug_host.substr(0, sep_pos);
 	}
diff --git a/core/input/input.cpp b/core/input/input.cpp
index 7e2227c729..a0c00d7716 100644
--- a/core/input/input.cpp
+++ b/core/input/input.cpp
@@ -236,7 +236,7 @@ void Input::get_argument_options(const StringName &p_function, int p_idx, List<S
 				continue;
 			}
 
-			String name = pi.name.substr(pi.name.find("/") + 1, pi.name.length());
+			String name = pi.name.substr(pi.name.find_char('/') + 1, pi.name.length());
 			r_options->push_back(name.quote());
 		}
 	}
diff --git a/core/input/input_map.cpp b/core/input/input_map.cpp
index 954df36f3e..54f20a0bcc 100644
--- a/core/input/input_map.cpp
+++ b/core/input/input_map.cpp
@@ -104,7 +104,7 @@ void InputMap::get_argument_options(const StringName &p_function, int p_idx, Lis
 				continue;
 			}
 
-			String name = pi.name.substr(pi.name.find("/") + 1, pi.name.length());
+			String name = pi.name.substr(pi.name.find_char('/') + 1, pi.name.length());
 			r_options->push_back(name.quote());
 		}
 	}
@@ -302,7 +302,7 @@ void InputMap::load_from_project_settings() {
 			continue;
 		}
 
-		String name = pi.name.substr(pi.name.find("/") + 1, pi.name.length());
+		String name = pi.name.substr(pi.name.find_char('/') + 1, pi.name.length());
 
 		Dictionary action = GLOBAL_GET(pi.name);
 		float deadzone = action.has("deadzone") ? (float)action["deadzone"] : DEFAULT_DEADZONE;
diff --git a/core/io/dir_access.cpp b/core/io/dir_access.cpp
index 5d2f65ca99..14588923cb 100644
--- a/core/io/dir_access.cpp
+++ b/core/io/dir_access.cpp
@@ -155,9 +155,9 @@ Error DirAccess::make_dir_recursive(const String &p_dir) {
 	} else if (full_dir.begins_with("user://")) {
 		base = "user://";
 	} else if (full_dir.is_network_share_path()) {
-		int pos = full_dir.find("/", 2);
+		int pos = full_dir.find_char('/', 2);
 		ERR_FAIL_COND_V(pos < 0, ERR_INVALID_PARAMETER);
-		pos = full_dir.find("/", pos + 1);
+		pos = full_dir.find_char('/', pos + 1);
 		ERR_FAIL_COND_V(pos < 0, ERR_INVALID_PARAMETER);
 		base = full_dir.substr(0, pos + 1);
 	} else if (full_dir.begins_with("/")) {
diff --git a/core/io/http_client.cpp b/core/io/http_client.cpp
index 9e426c4908..b7a324e710 100644
--- a/core/io/http_client.cpp
+++ b/core/io/http_client.cpp
@@ -101,7 +101,7 @@ Error HTTPClient::verify_headers(const Vector<String> &p_headers) {
 	for (int i = 0; i < p_headers.size(); i++) {
 		String sanitized = p_headers[i].strip_edges();
 		ERR_FAIL_COND_V_MSG(sanitized.is_empty(), ERR_INVALID_PARAMETER, vformat("Invalid HTTP header at index %d: empty.", i));
-		ERR_FAIL_COND_V_MSG(sanitized.find(":") < 1, ERR_INVALID_PARAMETER,
+		ERR_FAIL_COND_V_MSG(sanitized.find_char(':') < 1, ERR_INVALID_PARAMETER,
 				vformat("Invalid HTTP header at index %d: String must contain header-value pair, delimited by ':', but was: '%s'.", i, p_headers[i]));
 	}
 
@@ -113,7 +113,7 @@ Dictionary HTTPClient::_get_response_headers_as_dictionary() {
 	get_response_headers(&rh);
 	Dictionary ret;
 	for (const String &s : rh) {
-		int sp = s.find(":");
+		int sp = s.find_char(':');
 		if (sp == -1) {
 			continue;
 		}
diff --git a/core/io/http_client_tcp.cpp b/core/io/http_client_tcp.cpp
index 237ba30a80..1382aecb38 100644
--- a/core/io/http_client_tcp.cpp
+++ b/core/io/http_client_tcp.cpp
@@ -508,11 +508,11 @@ Error HTTPClientTCP::poll() {
 							continue;
 						}
 						if (s.begins_with("content-length:")) {
-							body_size = s.substr(s.find(":") + 1, s.length()).strip_edges().to_int();
+							body_size = s.substr(s.find_char(':') + 1, s.length()).strip_edges().to_int();
 							body_left = body_size;
 
 						} else if (s.begins_with("transfer-encoding:")) {
-							String encoding = header.substr(header.find(":") + 1, header.length()).strip_edges();
+							String encoding = header.substr(header.find_char(':') + 1, header.length()).strip_edges();
 							if (encoding == "chunked") {
 								chunked = true;
 							}
diff --git a/core/io/plist.cpp b/core/io/plist.cpp
index 32e83c31f2..26b8c39495 100644
--- a/core/io/plist.cpp
+++ b/core/io/plist.cpp
@@ -661,12 +661,12 @@ bool PList::load_string(const String &p_string, String &r_err_out) {
 	List<Ref<PListNode>> stack;
 	String key;
 	while (pos >= 0) {
-		int open_token_s = p_string.find("<", pos);
+		int open_token_s = p_string.find_char('<', pos);
 		if (open_token_s == -1) {
 			r_err_out = "Unexpected end of data. No tags found.";
 			return false;
 		}
-		int open_token_e = p_string.find(">", open_token_s);
+		int open_token_e = p_string.find_char('>', open_token_s);
 		pos = open_token_e;
 
 		String token = p_string.substr(open_token_s + 1, open_token_e - open_token_s - 1);
@@ -676,7 +676,7 @@ bool PList::load_string(const String &p_string, String &r_err_out) {
 		}
 		String value;
 		if (token[0] == '?' || token[0] == '!') { // Skip <?xml ... ?> and <!DOCTYPE ... >
-			int end_token_e = p_string.find(">", open_token_s);
+			int end_token_e = p_string.find_char('>', open_token_s);
 			pos = end_token_e;
 			continue;
 		}
@@ -769,7 +769,7 @@ bool PList::load_string(const String &p_string, String &r_err_out) {
 				r_err_out = vformat("Mismatched <%s> tag.", token);
 				return false;
 			}
-			int end_token_e = p_string.find(">", end_token_s);
+			int end_token_e = p_string.find_char('>', end_token_s);
 			pos = end_token_e;
 			String end_token = p_string.substr(end_token_s + 2, end_token_e - end_token_s - 2);
 			if (end_token != token) {
diff --git a/core/io/resource_loader.cpp b/core/io/resource_loader.cpp
index 3fea697d0b..ecd0a91aa4 100644
--- a/core/io/resource_loader.cpp
+++ b/core/io/resource_loader.cpp
@@ -1206,7 +1206,7 @@ String ResourceLoader::_path_remap(const String &p_path, bool *r_translation_rem
 
 		int best_score = 0;
 		for (int i = 0; i < res_remaps.size(); i++) {
-			int split = res_remaps[i].rfind(":");
+			int split = res_remaps[i].rfind_char(':');
 			if (split == -1) {
 				continue;
 			}
@@ -1498,11 +1498,11 @@ Vector<String> ResourceLoader::list_directory(const String &p_directory) {
 			}
 		} else {
 			if (d.ends_with(".import") || d.ends_with(".remap") || d.ends_with(".uid")) {
-				d = d.substr(0, d.rfind("."));
+				d = d.substr(0, d.rfind_char('.'));
 			}
 
 			if (d.ends_with(".gdc")) {
-				d = d.substr(0, d.rfind("."));
+				d = d.substr(0, d.rfind_char('.'));
 				d += ".gd";
 			}
 
diff --git a/core/io/translation_loader_po.cpp b/core/io/translation_loader_po.cpp
index 7a11d06df6..1761d6fa23 100644
--- a/core/io/translation_loader_po.cpp
+++ b/core/io/translation_loader_po.cpp
@@ -108,7 +108,7 @@ Ref<Resource> TranslationLoaderPO::load_translation(Ref<FileAccess> f, Error *r_
 					// Record plural rule.
 					int p_start = config.find("Plural-Forms");
 					if (p_start != -1) {
-						int p_end = config.find("\n", p_start);
+						int p_end = config.find_char('\n', p_start);
 						translation->set_plural_rule(config.substr(p_start, p_end - p_start));
 					}
 				} else {
@@ -224,7 +224,7 @@ Ref<Resource> TranslationLoaderPO::load_translation(Ref<FileAccess> f, Error *r_
 					// Record plural rule.
 					int p_start = config.find("Plural-Forms");
 					if (p_start != -1) {
-						int p_end = config.find("\n", p_start);
+						int p_end = config.find_char('\n', p_start);
 						translation->set_plural_rule(config.substr(p_start, p_end - p_start));
 						plural_forms = translation->get_plural_forms();
 					}
@@ -324,7 +324,7 @@ Ref<Resource> TranslationLoaderPO::load_translation(Ref<FileAccess> f, Error *r_
 	Vector<String> configs = config.split("\n");
 	for (int i = 0; i < configs.size(); i++) {
 		String c = configs[i].strip_edges();
-		int p = c.find(":");
+		int p = c.find_char(':');
 		if (p == -1) {
 			continue;
 		}
diff --git a/core/string/node_path.cpp b/core/string/node_path.cpp
index 3faf3bb0c5..40c81edf4c 100644
--- a/core/string/node_path.cpp
+++ b/core/string/node_path.cpp
@@ -407,7 +407,7 @@ NodePath::NodePath(const String &p_path) {
 	bool absolute = (path[0] == '/');
 	bool last_is_slash = true;
 	int slices = 0;
-	int subpath_pos = path.find(":");
+	int subpath_pos = path.find_char(':');
 
 	if (subpath_pos != -1) {
 		int from = subpath_pos + 1;
diff --git a/core/string/translation_po.cpp b/core/string/translation_po.cpp
index da79e472e7..7eb8a2afeb 100644
--- a/core/string/translation_po.cpp
+++ b/core/string/translation_po.cpp
@@ -227,11 +227,11 @@ void TranslationPO::set_plural_rule(const String &p_plural_rule) {
 	// Set plural_forms and plural_rule.
 	// p_plural_rule passed in has the form "Plural-Forms: nplurals=2; plural=(n >= 2);".
 
-	int first_semi_col = p_plural_rule.find(";");
-	plural_forms = p_plural_rule.substr(p_plural_rule.find("=") + 1, first_semi_col - (p_plural_rule.find("=") + 1)).to_int();
+	int first_semi_col = p_plural_rule.find_char(';');
+	plural_forms = p_plural_rule.substr(p_plural_rule.find_char('=') + 1, first_semi_col - (p_plural_rule.find_char('=') + 1)).to_int();
 
-	int expression_start = p_plural_rule.find("=", first_semi_col) + 1;
-	int second_semi_col = p_plural_rule.rfind(";");
+	int expression_start = p_plural_rule.find_char('=', first_semi_col) + 1;
+	int second_semi_col = p_plural_rule.rfind_char(';');
 	plural_rule = p_plural_rule.substr(expression_start, second_semi_col - expression_start).strip_edges();
 
 	// Setup the cache to make evaluating plural rule faster later on.
diff --git a/core/string/ustring.cpp b/core/string/ustring.cpp
index 521dfe0b8c..9e99fc3b2f 100644
--- a/core/string/ustring.cpp
+++ b/core/string/ustring.cpp
@@ -246,27 +246,27 @@ Error String::parse_url(String &r_scheme, String &r_host, int &r_port, String &r
 			base = base.substr(pos + 3, base.length() - pos - 3);
 		}
 	}
-	pos = base.find("#");
+	pos = base.find_char('#');
 	// Fragment
 	if (pos != -1) {
 		r_fragment = base.substr(pos + 1);
 		base = base.substr(0, pos);
 	}
-	pos = base.find("/");
+	pos = base.find_char('/');
 	// Path
 	if (pos != -1) {
 		r_path = base.substr(pos, base.length() - pos);
 		base = base.substr(0, pos);
 	}
 	// Host
-	pos = base.find("@");
+	pos = base.find_char('@');
 	if (pos != -1) {
 		// Strip credentials
 		base = base.substr(pos + 1, base.length() - pos - 1);
 	}
 	if (base.begins_with("[")) {
 		// Literal IPv6
-		pos = base.rfind("]");
+		pos = base.rfind_char(']');
 		if (pos == -1) {
 			return ERR_INVALID_PARAMETER;
 		}
@@ -277,7 +277,7 @@ Error String::parse_url(String &r_scheme, String &r_host, int &r_port, String &r
 		if (base.get_slice_count(":") > 2) {
 			return ERR_INVALID_PARAMETER;
 		}
-		pos = base.rfind(":");
+		pos = base.rfind_char(':');
 		if (pos == -1) {
 			r_host = base;
 			base = "";
@@ -2641,7 +2641,7 @@ int64_t String::to_int() const {
 		return 0;
 	}
 
-	int to = (find(".") >= 0) ? find(".") : length();
+	int to = (find_char('.') >= 0) ? find_char('.') : length();
 
 	int64_t integer = 0;
 	int64_t sign = 1;
@@ -4580,7 +4580,7 @@ String String::simplify_path() const {
 			if (p == -1) {
 				p = s.find(":\\");
 			}
-			if (p != -1 && p < s.find("/")) {
+			if (p != -1 && p < s.find_char('/')) {
 				drive = s.substr(0, p + 2);
 				s = s.substr(p + 2);
 			}
@@ -5025,7 +5025,7 @@ String String::xml_unescape() const {
 
 String String::pad_decimals(int p_digits) const {
 	String s = *this;
-	int c = s.find(".");
+	int c = s.find_char('.');
 
 	if (c == -1) {
 		if (p_digits <= 0) {
@@ -5049,7 +5049,7 @@ String String::pad_decimals(int p_digits) const {
 
 String String::pad_zeros(int p_digits) const {
 	String s = *this;
-	int end = s.find(".");
+	int end = s.find_char('.');
 
 	if (end == -1) {
 		end = s.length();
@@ -5316,7 +5316,7 @@ String String::validate_filename() const {
 }
 
 bool String::is_valid_ip_address() const {
-	if (find(":") >= 0) {
+	if (find_char(':') >= 0) {
 		Vector<String> ip = split(":");
 		for (int i = 0; i < ip.size(); i++) {
 			const String &n = ip[i];
@@ -5386,13 +5386,13 @@ String String::get_base_dir() const {
 	// Windows UNC network share path.
 	if (end == 0) {
 		if (is_network_share_path()) {
-			basepos = find("/", 2);
+			basepos = find_char('/', 2);
 			if (basepos == -1) {
-				basepos = find("\\", 2);
+				basepos = find_char('\\', 2);
 			}
-			int servpos = find("/", basepos + 1);
+			int servpos = find_char('/', basepos + 1);
 			if (servpos == -1) {
-				servpos = find("\\", basepos + 1);
+				servpos = find_char('\\', basepos + 1);
 			}
 			if (servpos != -1) {
 				end = servpos + 1;
@@ -5416,7 +5416,7 @@ String String::get_base_dir() const {
 		rs = *this;
 	}
 
-	int sep = MAX(rs.rfind("/"), rs.rfind("\\"));
+	int sep = MAX(rs.rfind_char('/'), rs.rfind_char('\\'));
 	if (sep == -1) {
 		return base;
 	}
@@ -5425,7 +5425,7 @@ String String::get_base_dir() const {
 }
 
 String String::get_file() const {
-	int sep = MAX(rfind("/"), rfind("\\"));
+	int sep = MAX(rfind_char('/'), rfind_char('\\'));
 	if (sep == -1) {
 		return *this;
 	}
@@ -5434,8 +5434,8 @@ String String::get_file() const {
 }
 
 String String::get_extension() const {
-	int pos = rfind(".");
-	if (pos < 0 || pos < MAX(rfind("/"), rfind("\\"))) {
+	int pos = rfind_char('.');
+	if (pos < 0 || pos < MAX(rfind_char('/'), rfind_char('\\'))) {
 		return "";
 	}
 
@@ -5533,8 +5533,8 @@ String String::validate_node_name() const {
 }
 
 String String::get_basename() const {
-	int pos = rfind(".");
-	if (pos < 0 || pos < MAX(rfind("/"), rfind("\\"))) {
+	int pos = rfind_char('.');
+	if (pos < 0 || pos < MAX(rfind_char('/'), rfind_char('\\'))) {
 		return *this;
 	}
 
diff --git a/drivers/alsa/audio_driver_alsa.cpp b/drivers/alsa/audio_driver_alsa.cpp
index 0c9635339b..6ee22b6eb5 100644
--- a/drivers/alsa/audio_driver_alsa.cpp
+++ b/drivers/alsa/audio_driver_alsa.cpp
@@ -80,7 +80,7 @@ Error AudioDriverALSA::init_output_device() {
 		status = snd_pcm_open(&pcm_handle, "default", SND_PCM_STREAM_PLAYBACK, SND_PCM_NONBLOCK);
 	} else {
 		String device = output_device_name;
-		int pos = device.find(";");
+		int pos = device.find_char(';');
 		if (pos != -1) {
 			device = device.substr(0, pos);
 		}
diff --git a/drivers/unix/os_unix.cpp b/drivers/unix/os_unix.cpp
index 3976ae7d84..ffc270cd36 100644
--- a/drivers/unix/os_unix.cpp
+++ b/drivers/unix/os_unix.cpp
@@ -860,7 +860,7 @@ String OS_Unix::get_locale() const {
 	}
 
 	String locale = get_environment("LANG");
-	int tp = locale.find(".");
+	int tp = locale.find_char('.');
 	if (tp != -1) {
 		locale = locale.substr(0, tp);
 	}
diff --git a/drivers/windows/dir_access_windows.cpp b/drivers/windows/dir_access_windows.cpp
index 24a26b56ef..3ddbde72c4 100644
--- a/drivers/windows/dir_access_windows.cpp
+++ b/drivers/windows/dir_access_windows.cpp
@@ -230,7 +230,7 @@ String DirAccessWindows::get_current_dir(bool p_include_drive) const {
 		return cdir;
 	} else {
 		if (_get_root_string().is_empty()) {
-			int pos = cdir.find(":");
+			int pos = cdir.find_char(':');
 			if (pos != -1) {
 				return cdir.substr(pos + 1);
 			}
@@ -344,7 +344,7 @@ String DirAccessWindows::get_filesystem_type() const {
 		return "Network Share";
 	}
 
-	int unit_end = path.find(":");
+	int unit_end = path.find_char(':');
 	ERR_FAIL_COND_V(unit_end == -1, String());
 	String unit = path.substr(0, unit_end + 1) + "\\";
 
diff --git a/drivers/windows/file_access_windows.cpp b/drivers/windows/file_access_windows.cpp
index 7d2247d41a..4a0e5e5f49 100644
--- a/drivers/windows/file_access_windows.cpp
+++ b/drivers/windows/file_access_windows.cpp
@@ -64,7 +64,7 @@ bool FileAccessWindows::is_path_invalid(const String &p_path) {
 	// Check for invalid operating system file.
 	String fname = p_path.get_file().to_lower();
 
-	int dot = fname.find(".");
+	int dot = fname.find_char('.');
 	if (dot != -1) {
 		fname = fname.substr(0, dot);
 	}
diff --git a/editor/animation_bezier_editor.cpp b/editor/animation_bezier_editor.cpp
index b923dc0732..36ca417638 100644
--- a/editor/animation_bezier_editor.cpp
+++ b/editor/animation_bezier_editor.cpp
@@ -275,7 +275,7 @@ void AnimationBezierTrackEdit::_notification(int p_what) {
 				}
 
 				String base_path = animation->track_get_path(i);
-				int end = base_path.find(":");
+				int end = base_path.find_char(':');
 				if (end != -1) {
 					base_path = base_path.substr(0, end + 1);
 				}
diff --git a/editor/animation_track_editor.cpp b/editor/animation_track_editor.cpp
index 55ea7c0082..7a1296c411 100644
--- a/editor/animation_track_editor.cpp
+++ b/editor/animation_track_editor.cpp
@@ -4340,7 +4340,7 @@ void AnimationTrackEditor::insert_node_value_key(Node *p_node, const String &p_p
 			if (track_path == np) {
 				actual_value = value; // All good.
 			} else {
-				int sep = track_path.rfind(":");
+				int sep = track_path.rfind_char(':');
 				if (sep != -1) {
 					String base_path = track_path.substr(0, sep);
 					if (base_path == np) {
@@ -6495,7 +6495,7 @@ void AnimationTrackEditor::_edit_menu_pressed(int p_option) {
 					path = NodePath(node->get_path().get_names(), path.get_subnames(), true); // Store full path instead for copying.
 				} else {
 					text = path;
-					int sep = text.find(":");
+					int sep = text.find_char(':');
 					if (sep != -1) {
 						text = text.substr(sep + 1, text.length());
 					}
diff --git a/editor/connections_dialog.cpp b/editor/connections_dialog.cpp
index b114977c3b..d76c324be0 100644
--- a/editor/connections_dialog.cpp
+++ b/editor/connections_dialog.cpp
@@ -524,7 +524,7 @@ void ConnectDialog::set_dst_node(Node *p_node) {
 StringName ConnectDialog::get_dst_method_name() const {
 	String txt = dst_method->get_text();
 	if (txt.contains("(")) {
-		txt = txt.left(txt.find("(")).strip_edges();
+		txt = txt.left(txt.find_char('(')).strip_edges();
 	}
 	return txt;
 }
diff --git a/editor/create_dialog.cpp b/editor/create_dialog.cpp
index 78dc772d9e..2273014f72 100644
--- a/editor/create_dialog.cpp
+++ b/editor/create_dialog.cpp
@@ -160,13 +160,13 @@ bool CreateDialog::_should_hide_type(const StringName &p_type) const {
 
 		String script_path = ScriptServer::get_global_class_path(p_type);
 		if (script_path.begins_with("res://addons/")) {
-			int i = script_path.find("/", 13); // 13 is length of "res://addons/".
+			int i = script_path.find_char('/', 13); // 13 is length of "res://addons/".
 			while (i > -1) {
 				const String plugin_path = script_path.substr(0, i).path_join("plugin.cfg");
 				if (FileAccess::exists(plugin_path)) {
 					return !EditorNode::get_singleton()->is_addon_plugin_enabled(plugin_path);
 				}
-				i = script_path.find("/", i + 1);
+				i = script_path.find_char('/', i + 1);
 			}
 		}
 	}
diff --git a/editor/debugger/debug_adapter/debug_adapter_parser.cpp b/editor/debugger/debug_adapter/debug_adapter_parser.cpp
index 2af629676a..904085630b 100644
--- a/editor/debugger/debug_adapter/debug_adapter_parser.cpp
+++ b/editor/debugger/debug_adapter/debug_adapter_parser.cpp
@@ -147,7 +147,7 @@ Dictionary DebugAdapterParser::req_initialize(const Dictionary &p_params) const
 		for (List<String>::Element *E = breakpoints.front(); E; E = E->next()) {
 			String breakpoint = E->get();
 
-			String path = breakpoint.left(breakpoint.find(":", 6)); // Skip initial part of path, aka "res://"
+			String path = breakpoint.left(breakpoint.find_char(':', 6)); // Skip initial part of path, aka "res://"
 			int line = breakpoint.substr(path.size()).to_int();
 
 			DebugAdapterProtocol::get_singleton()->on_debug_breakpoint_toggled(path, line, true);
diff --git a/editor/debugger/editor_debugger_node.cpp b/editor/debugger/editor_debugger_node.cpp
index 0f948b4ed5..909651da45 100644
--- a/editor/debugger/editor_debugger_node.cpp
+++ b/editor/debugger/editor_debugger_node.cpp
@@ -160,9 +160,9 @@ void EditorDebuggerNode::_text_editor_stack_goto(const ScriptEditorDebugger *p_d
 	} else {
 		// If the script is built-in, it can be opened only if the scene is loaded in memory.
 		int i = file.find("::");
-		int j = file.rfind("(", i);
+		int j = file.rfind_char('(', i);
 		if (j > -1) { // If the script is named, the string is "name (file)", so we need to extract the path.
-			file = file.substr(j + 1, file.find(")", i) - j - 1);
+			file = file.substr(j + 1, file.find_char(')', i) - j - 1);
 		}
 		Ref<PackedScene> ps = ResourceLoader::load(file.get_slice("::", 0));
 		stack_script = ResourceLoader::load(file);
@@ -183,9 +183,9 @@ void EditorDebuggerNode::_text_editor_stack_clear(const ScriptEditorDebugger *p_
 	} else {
 		// If the script is built-in, it can be opened only if the scene is loaded in memory.
 		int i = file.find("::");
-		int j = file.rfind("(", i);
+		int j = file.rfind_char('(', i);
 		if (j > -1) { // If the script is named, the string is "name (file)", so we need to extract the path.
-			file = file.substr(j + 1, file.find(")", i) - j - 1);
+			file = file.substr(j + 1, file.find_char(')', i) - j - 1);
 		}
 		Ref<PackedScene> ps = ResourceLoader::load(file.get_slice("::", 0));
 		stack_script = ResourceLoader::load(file);
diff --git a/editor/debugger/editor_debugger_tree.cpp b/editor/debugger/editor_debugger_tree.cpp
index 4d67800e6e..a9e4adf674 100644
--- a/editor/debugger/editor_debugger_tree.cpp
+++ b/editor/debugger/editor_debugger_tree.cpp
@@ -382,7 +382,7 @@ void EditorDebuggerTree::_item_menu_id_pressed(int p_option) {
 				text = ".";
 			} else {
 				text = text.replace("/root/", "");
-				int slash = text.find("/");
+				int slash = text.find_char('/');
 				if (slash < 0) {
 					text = ".";
 				} else {
diff --git a/editor/dependency_editor.cpp b/editor/dependency_editor.cpp
index 8ba5811ffa..9ca12070fe 100644
--- a/editor/dependency_editor.cpp
+++ b/editor/dependency_editor.cpp
@@ -471,7 +471,7 @@ void DependencyRemoveDialog::_find_localization_remaps_of_removed_files(Vector<R
 			for (int j = 0; j < remap_keys.size(); j++) {
 				PackedStringArray remapped_files = remaps[remap_keys[j]];
 				for (int k = 0; k < remapped_files.size(); k++) {
-					int splitter_pos = remapped_files[k].rfind(":");
+					int splitter_pos = remapped_files[k].rfind_char(':');
 					String res_path = remapped_files[k].substr(0, splitter_pos);
 					if (res_path == path) {
 						String locale_name = remapped_files[k].substr(splitter_pos + 1);
diff --git a/editor/directory_create_dialog.cpp b/editor/directory_create_dialog.cpp
index ee03d5a7f6..d68af88fc8 100644
--- a/editor/directory_create_dialog.cpp
+++ b/editor/directory_create_dialog.cpp
@@ -142,7 +142,7 @@ void DirectoryCreateDialog::config(const String &p_base_dir, const Callable &p_a
 	validation_panel->update();
 
 	if (p_mode == MODE_FILE) {
-		int extension_pos = p_default_name.rfind(".");
+		int extension_pos = p_default_name.rfind_char('.');
 		if (extension_pos > -1) {
 			dir_path->select(0, extension_pos);
 			return;
diff --git a/editor/editor_asset_installer.cpp b/editor/editor_asset_installer.cpp
index bce0c87452..72755e8943 100644
--- a/editor/editor_asset_installer.cpp
+++ b/editor/editor_asset_installer.cpp
@@ -130,14 +130,14 @@ void EditorAssetInstaller::open_asset(const String &p_path, bool p_autoskip_topl
 
 		// Create intermediate directories if they aren't reported by unzip.
 		// We are only interested in subfolders, so skip the root slash.
-		int separator = source_name.find("/", 1);
+		int separator = source_name.find_char('/', 1);
 		while (separator != -1) {
 			String dir_name = source_name.substr(0, separator + 1);
 			if (!dir_name.is_empty() && !asset_files.has(dir_name)) {
 				asset_files.insert(dir_name);
 			}
 
-			separator = source_name.find("/", separator + 1);
+			separator = source_name.find_char('/', separator + 1);
 		}
 
 		if (!source_name.is_empty() && !asset_files.has(source_name)) {
@@ -214,7 +214,7 @@ void EditorAssetInstaller::_rebuild_source_tree() {
 
 		TreeItem *parent_item;
 
-		int separator = path.rfind("/");
+		int separator = path.rfind_char('/');
 		if (separator == -1) {
 			parent_item = root;
 		} else {
@@ -313,7 +313,7 @@ void EditorAssetInstaller::_rebuild_destination_tree() {
 
 		TreeItem *parent_item;
 
-		int separator = path.rfind("/");
+		int separator = path.rfind_char('/');
 		if (separator == -1) {
 			parent_item = root;
 		} else {
diff --git a/editor/editor_folding.cpp b/editor/editor_folding.cpp
index 18f5610655..5cb38fa875 100644
--- a/editor/editor_folding.cpp
+++ b/editor/editor_folding.cpp
@@ -249,7 +249,7 @@ void EditorFolding::_do_object_unfolds(Object *p_object, HashSet<Ref<Resource>>
 					}
 				}
 			} else { //path
-				int last = E.name.rfind("/");
+				int last = E.name.rfind_char('/');
 				if (last != -1) {
 					bool can_revert = EditorPropertyRevert::can_property_revert(p_object, E.name);
 					if (can_revert) {
diff --git a/editor/editor_help.cpp b/editor/editor_help.cpp
index 0ca1ed2d50..9aec9d6b15 100644
--- a/editor/editor_help.cpp
+++ b/editor/editor_help.cpp
@@ -148,7 +148,7 @@ static String _contextualize_class_specifier(const String &p_class_specifier, co
 
 	// Here equal length + begins_with from above implies p_class_specifier == p_edited_class :)
 	if (p_class_specifier.length() == p_edited_class.length()) {
-		int rfind = p_class_specifier.rfind(".");
+		int rfind = p_class_specifier.rfind_char('.');
 		if (rfind == -1) { // Single identifier
 			return p_class_specifier;
 		}
@@ -234,7 +234,7 @@ void EditorHelp::_class_desc_select(const String &p_select) {
 			enum_class_name = "@GlobalScope";
 			enum_name = link;
 		} else {
-			const int dot_pos = link.rfind(".");
+			const int dot_pos = link.rfind_char('.');
 			if (dot_pos >= 0) {
 				enum_class_name = link.left(dot_pos);
 				enum_name = link.substr(dot_pos + 1);
@@ -3252,7 +3252,7 @@ EditorHelpBit::HelpData EditorHelpBit::_get_property_help_data(const StringName
 				enum_class_name = "@GlobalScope";
 				enum_name = property.enumeration;
 			} else {
-				const int dot_pos = property.enumeration.rfind(".");
+				const int dot_pos = property.enumeration.rfind_char('.');
 				if (dot_pos >= 0) {
 					enum_class_name = property.enumeration.left(dot_pos);
 					enum_name = property.enumeration.substr(dot_pos + 1);
@@ -3619,7 +3619,7 @@ void EditorHelpBit::_meta_clicked(const String &p_select) {
 			enum_class_name = "@GlobalScope";
 			enum_name = link;
 		} else {
-			const int dot_pos = link.rfind(".");
+			const int dot_pos = link.rfind_char('.');
 			if (dot_pos >= 0) {
 				enum_class_name = link.left(dot_pos);
 				enum_name = link.substr(dot_pos + 1);
diff --git a/editor/editor_inspector.cpp b/editor/editor_inspector.cpp
index fa5a059aa0..6b3c6b462d 100644
--- a/editor/editor_inspector.cpp
+++ b/editor/editor_inspector.cpp
@@ -3131,7 +3131,7 @@ void EditorInspector::update_tree() {
 
 		if (!array_prefix.is_empty()) {
 			path = path.trim_prefix(array_prefix);
-			int char_index = path.find("/");
+			int char_index = path.find_char('/');
 			if (char_index >= 0) {
 				path = path.right(-char_index - 1);
 			} else {
@@ -3171,10 +3171,10 @@ void EditorInspector::update_tree() {
 		}
 
 		// Get the property label's string.
-		String name_override = (path.contains("/")) ? path.substr(path.rfind("/") + 1) : path;
+		String name_override = (path.contains("/")) ? path.substr(path.rfind_char('/') + 1) : path;
 		String feature_tag;
 		{
-			const int dot = name_override.find(".");
+			const int dot = name_override.find_char('.');
 			if (dot != -1) {
 				feature_tag = name_override.substr(dot);
 				name_override = name_override.substr(0, dot);
@@ -3189,7 +3189,7 @@ void EditorInspector::update_tree() {
 		const String property_label_string = EditorPropertyNameProcessor::get_singleton()->process_name(name_override, name_style, p.name, doc_name) + feature_tag;
 
 		// Remove the property from the path.
-		int idx = path.rfind("/");
+		int idx = path.rfind_char('/');
 		if (idx > -1) {
 			path = path.left(idx);
 		} else {
@@ -3320,7 +3320,7 @@ void EditorInspector::update_tree() {
 				array_element_prefix = class_name_components[0];
 				editor_inspector_array = memnew(EditorInspectorArray(all_read_only));
 
-				String array_label = path.contains("/") ? path.substr(path.rfind("/") + 1) : path;
+				String array_label = path.contains("/") ? path.substr(path.rfind_char('/') + 1) : path;
 				array_label = EditorPropertyNameProcessor::get_singleton()->process_name(property_label_string, property_name_style, p.name, doc_name);
 				int page = per_array_page.has(array_element_prefix) ? per_array_page[array_element_prefix] : 0;
 				editor_inspector_array->setup_with_move_element_function(object, array_label, array_element_prefix, page, c, use_folding);
diff --git a/editor/editor_node.cpp b/editor/editor_node.cpp
index 87f1f1b8a0..f056a477c4 100644
--- a/editor/editor_node.cpp
+++ b/editor/editor_node.cpp
@@ -253,8 +253,8 @@ void EditorNode::disambiguate_filenames(const Vector<String> p_full_paths, Vecto
 				// append that to yield "folder/foo.tscn".
 				if (difference > 0) {
 					String parent = full_path.substr(0, difference);
-					int slash_idx = parent.rfind("/");
-					slash_idx = parent.rfind("/", slash_idx - 1);
+					int slash_idx = parent.rfind_char('/');
+					slash_idx = parent.rfind_char('/', slash_idx - 1);
 					parent = (slash_idx >= 0 && parent.length() > 1) ? parent.substr(slash_idx + 1) : parent;
 					r_filenames.write[set_idx] = parent + r_filenames[set_idx];
 				}
diff --git a/editor/editor_properties_array_dict.cpp b/editor/editor_properties_array_dict.cpp
index 4b4c02f49b..3cc3a0f7c2 100644
--- a/editor/editor_properties_array_dict.cpp
+++ b/editor/editor_properties_array_dict.cpp
@@ -740,10 +740,10 @@ void EditorPropertyArray::setup(Variant::Type p_array_type, const String &p_hint
 	// The format of p_hint_string is:
 	// subType/subTypeHint:nextSubtype ... etc.
 	if (!p_hint_string.is_empty()) {
-		int hint_subtype_separator = p_hint_string.find(":");
+		int hint_subtype_separator = p_hint_string.find_char(':');
 		if (hint_subtype_separator >= 0) {
 			String subtype_string = p_hint_string.substr(0, hint_subtype_separator);
-			int slash_pos = subtype_string.find("/");
+			int slash_pos = subtype_string.find_char('/');
 			if (slash_pos >= 0) {
 				subtype_hint = PropertyHint(subtype_string.substr(slash_pos + 1, subtype_string.size() - slash_pos - 1).to_int());
 				subtype_string = subtype_string.substr(0, slash_pos);
@@ -1006,10 +1006,10 @@ void EditorPropertyDictionary::setup(PropertyHint p_hint, const String &p_hint_s
 	PackedStringArray types = p_hint_string.split(";");
 	if (types.size() > 0 && !types[0].is_empty()) {
 		String key = types[0];
-		int hint_key_subtype_separator = key.find(":");
+		int hint_key_subtype_separator = key.find_char(':');
 		if (hint_key_subtype_separator >= 0) {
 			String key_subtype_string = key.substr(0, hint_key_subtype_separator);
-			int slash_pos = key_subtype_string.find("/");
+			int slash_pos = key_subtype_string.find_char('/');
 			if (slash_pos >= 0) {
 				key_subtype_hint = PropertyHint(key_subtype_string.substr(slash_pos + 1, key_subtype_string.size() - slash_pos - 1).to_int());
 				key_subtype_string = key_subtype_string.substr(0, slash_pos);
@@ -1025,10 +1025,10 @@ void EditorPropertyDictionary::setup(PropertyHint p_hint, const String &p_hint_s
 	}
 	if (types.size() > 1 && !types[1].is_empty()) {
 		String value = types[1];
-		int hint_value_subtype_separator = value.find(":");
+		int hint_value_subtype_separator = value.find_char(':');
 		if (hint_value_subtype_separator >= 0) {
 			String value_subtype_string = value.substr(0, hint_value_subtype_separator);
-			int slash_pos = value_subtype_string.find("/");
+			int slash_pos = value_subtype_string.find_char('/');
 			if (slash_pos >= 0) {
 				value_subtype_hint = PropertyHint(value_subtype_string.substr(slash_pos + 1, value_subtype_string.size() - slash_pos - 1).to_int());
 				value_subtype_string = value_subtype_string.substr(0, slash_pos);
diff --git a/editor/editor_sectioned_inspector.cpp b/editor/editor_sectioned_inspector.cpp
index 27cbb9810c..d88cc4d5fa 100644
--- a/editor/editor_sectioned_inspector.cpp
+++ b/editor/editor_sectioned_inspector.cpp
@@ -96,7 +96,7 @@ class SectionedInspectorFilter : public Object {
 		List<PropertyInfo> pinfo;
 		edited->get_property_list(&pinfo);
 		for (PropertyInfo &pi : pinfo) {
-			int sp = pi.name.find("/");
+			int sp = pi.name.find_char('/');
 
 			if (pi.name == "resource_path" || pi.name == "resource_name" || pi.name == "resource_local_to_scene" || pi.name.begins_with("script/") || pi.name.begins_with("_global_script")) { //skip resource stuff
 				continue;
@@ -255,7 +255,7 @@ void SectionedInspector::update_category_list() {
 			continue;
 		}
 
-		int sp = pi.name.find("/");
+		int sp = pi.name.find_char('/');
 		if (sp == -1) {
 			pi.name = "global/" + pi.name;
 		}
diff --git a/editor/engine_update_label.cpp b/editor/engine_update_label.cpp
index facbfc7c6b..0d40181257 100644
--- a/editor/engine_update_label.cpp
+++ b/editor/engine_update_label.cpp
@@ -240,8 +240,8 @@ EngineUpdateLabel::VersionType EngineUpdateLabel::_get_version_type(const String
 }
 
 String EngineUpdateLabel::_extract_sub_string(const String &p_line) const {
-	int j = p_line.find("\"") + 1;
-	return p_line.substr(j, p_line.find("\"", j) - j);
+	int j = p_line.find_char('"') + 1;
+	return p_line.substr(j, p_line.find_char('"', j) - j);
 }
 
 void EngineUpdateLabel::_notification(int p_what) {
diff --git a/editor/filesystem_dock.cpp b/editor/filesystem_dock.cpp
index 3921cde71e..c7e12d1f3b 100644
--- a/editor/filesystem_dock.cpp
+++ b/editor/filesystem_dock.cpp
@@ -137,7 +137,7 @@ bool FileSystemList::edit_selected() {
 
 	String name = get_item_text(s);
 	line_editor->set_text(name);
-	line_editor->select(0, name.rfind("."));
+	line_editor->select(0, name.rfind_char('.'));
 
 	popup_edit_commited = false; // Start edit popup processing.
 	popup_editor->popup();
@@ -2432,7 +2432,7 @@ void FileSystemDock::_file_option(int p_option, const Vector<String> &p_selected
 
 					if (to_rename.is_file) {
 						String name = to_rename.path.get_file();
-						tree->set_editor_selection(0, name.rfind("."));
+						tree->set_editor_selection(0, name.rfind_char('.'));
 					} else {
 						String name = to_rename.path.left(-1).get_file(); // Removes the "/" suffix for folders.
 						tree->set_editor_selection(0, name.length());
@@ -3658,10 +3658,10 @@ void FileSystemDock::_file_list_gui_input(Ref<InputEvent> p_event) {
 			tree_item->select(0);
 		} else {
 			// Find parent folder.
-			fpath = fpath.substr(0, fpath.rfind("/") + 1);
+			fpath = fpath.substr(0, fpath.rfind_char('/') + 1);
 			if (fpath.size() > String("res://").size()) {
 				fpath = fpath.left(fpath.size() - 2); // Remove last '/'.
-				const int slash_idx = fpath.rfind("/");
+				const int slash_idx = fpath.rfind_char('/');
 				fpath = fpath.substr(slash_idx + 1, fpath.size() - slash_idx - 1);
 			}
 
diff --git a/editor/gui/editor_file_dialog.cpp b/editor/gui/editor_file_dialog.cpp
index 12f00b7a57..0381609804 100644
--- a/editor/gui/editor_file_dialog.cpp
+++ b/editor/gui/editor_file_dialog.cpp
@@ -156,7 +156,7 @@ void EditorFileDialog::popup_file_dialog() {
 }
 
 void EditorFileDialog::_focus_file_text() {
-	int lp = file->get_text().rfind(".");
+	int lp = file->get_text().rfind_char('.');
 	if (lp != -1) {
 		file->select(0, lp);
 		file->grab_focus();
@@ -1263,7 +1263,7 @@ void EditorFileDialog::set_current_path(const String &p_path) {
 	if (!p_path.size()) {
 		return;
 	}
-	int pos = MAX(p_path.rfind("/"), p_path.rfind("\\"));
+	int pos = MAX(p_path.rfind_char('/'), p_path.rfind_char('\\'));
 	if (pos == -1) {
 		set_current_file(p_path);
 	} else {
diff --git a/editor/import/resource_importer_imagefont.cpp b/editor/import/resource_importer_imagefont.cpp
index 44ae2b5ff1..950058e88e 100644
--- a/editor/import/resource_importer_imagefont.cpp
+++ b/editor/import/resource_importer_imagefont.cpp
@@ -199,7 +199,7 @@ Error ResourceImporterImageFont::import(ResourceUID::ID p_source_id, const Strin
 					case STEP_OFF_Y_BEGIN: {
 						// Read advance and offset.
 						if (range[c] == ' ') {
-							int next = range.find(" ", c + 1);
+							int next = range.find_char(' ', c + 1);
 							if (next < c) {
 								next = range.length();
 							}
diff --git a/editor/localization_editor.cpp b/editor/localization_editor.cpp
index 921467ccbc..7b2e6e81ee 100644
--- a/editor/localization_editor.cpp
+++ b/editor/localization_editor.cpp
@@ -441,7 +441,7 @@ void LocalizationEditor::_filesystem_files_moved(const String &p_old_file, const
 		bool remapped_files_updated = false;
 
 		for (int j = 0; j < remapped_files.size(); j++) {
-			int splitter_pos = remapped_files[j].rfind(":");
+			int splitter_pos = remapped_files[j].rfind_char(':');
 			String res_path = remapped_files[j].substr(0, splitter_pos);
 
 			if (res_path == p_old_file) {
@@ -482,7 +482,7 @@ void LocalizationEditor::_filesystem_file_removed(const String &p_file) {
 		for (int i = 0; i < remap_keys.size() && !remaps_changed; i++) {
 			PackedStringArray remapped_files = remaps[remap_keys[i]];
 			for (int j = 0; j < remapped_files.size() && !remaps_changed; j++) {
-				int splitter_pos = remapped_files[j].rfind(":");
+				int splitter_pos = remapped_files[j].rfind_char(':');
 				String res_path = remapped_files[j].substr(0, splitter_pos);
 				remaps_changed = p_file == res_path;
 				if (remaps_changed) {
@@ -567,7 +567,7 @@ void LocalizationEditor::update_translations() {
 				PackedStringArray selected = remaps[keys[i]];
 				for (int j = 0; j < selected.size(); j++) {
 					const String &s2 = selected[j];
-					int qp = s2.rfind(":");
+					int qp = s2.rfind_char(':');
 					String path = s2.substr(0, qp);
 					String locale = s2.substr(qp + 1, s2.length());
 
diff --git a/editor/plugins/asset_library_editor_plugin.cpp b/editor/plugins/asset_library_editor_plugin.cpp
index 8db106da07..7c9c003ea1 100644
--- a/editor/plugins/asset_library_editor_plugin.cpp
+++ b/editor/plugins/asset_library_editor_plugin.cpp
@@ -907,7 +907,7 @@ void EditorAssetLibrary::_image_request_completed(int p_status, int p_code, cons
 			for (int i = 0; i < headers.size(); i++) {
 				if (headers[i].findn("ETag:") == 0) { // Save etag
 					String cache_filename_base = EditorPaths::get_singleton()->get_cache_dir().path_join("assetimage_" + image_queue[p_queue_id].image_url.md5_text());
-					String new_etag = headers[i].substr(headers[i].find(":") + 1, headers[i].length()).strip_edges();
+					String new_etag = headers[i].substr(headers[i].find_char(':') + 1, headers[i].length()).strip_edges();
 					Ref<FileAccess> file = FileAccess::open(cache_filename_base + ".etag", FileAccess::WRITE);
 					if (file.is_valid()) {
 						file->store_line(new_etag);
diff --git a/editor/plugins/script_text_editor.cpp b/editor/plugins/script_text_editor.cpp
index fc8b8aa49f..cf586c792e 100644
--- a/editor/plugins/script_text_editor.cpp
+++ b/editor/plugins/script_text_editor.cpp
@@ -282,7 +282,7 @@ void ScriptTextEditor::_warning_clicked(const Variant &p_line) {
 		CodeEdit *text_editor = code_editor->get_text_editor();
 		String prev_line = line > 0 ? text_editor->get_line(line - 1) : "";
 		if (prev_line.contains("@warning_ignore")) {
-			const int closing_bracket_idx = prev_line.find(")");
+			const int closing_bracket_idx = prev_line.find_char(')');
 			const String text_to_insert = ", " + code.quote(quote_style);
 			text_editor->insert_text(text_to_insert, line - 1, closing_bracket_idx);
 		} else {
@@ -1205,7 +1205,7 @@ void ScriptTextEditor::_update_connected_methods() {
 
 		// Account for inner classes by stripping the class names from the method,
 		// starting from the right since our inner class might be inside of another inner class.
-		int pos = raw_name.rfind(".");
+		int pos = raw_name.rfind_char('.');
 		if (pos != -1) {
 			name = raw_name.substr(pos + 1);
 		}
diff --git a/editor/project_converter_3_to_4.cpp b/editor/project_converter_3_to_4.cpp
index d08610c93f..edf3ff7296 100644
--- a/editor/project_converter_3_to_4.cpp
+++ b/editor/project_converter_3_to_4.cpp
@@ -1970,7 +1970,7 @@ void ProjectConverter3To4::process_gdscript_line(String &line, const RegExContai
 	// -- func c(var a, var b) -> func c(a, b)
 	if (line.contains("func ") && line.contains("var ")) {
 		int start = line.find("func ");
-		start = line.substr(start).find("(") + start;
+		start = line.substr(start).find_char('(') + start;
 		int end = get_end_parenthesis(line.substr(start)) + 1;
 		if (end > -1) {
 			Vector<String> parts = parse_arguments(line.substr(start, end));
@@ -2120,12 +2120,12 @@ void ProjectConverter3To4::process_gdscript_line(String &line, const RegExContai
 		}
 	}
 	// -- func _init(p_x:int).(p_x):  -> func _init(p_x:int):\n\tsuper(p_x)    Object # https://github.com/godotengine/godot/issues/70542
-	if (line.contains(" _init(") && line.rfind(":") > 0) {
+	if (line.contains(" _init(") && line.rfind_char(':') > 0) {
 		//     func _init(p_arg1).(super4, super5, super6)->void:
 		// ^--^indent            ^super_start   super_end^
 		int indent = line.count("\t", 0, line.find("func"));
 		int super_start = line.find(".(");
-		int super_end = line.rfind(")");
+		int super_end = line.rfind_char(')');
 		if (super_start > 0 && super_end > super_start) {
 			line = line.substr(0, super_start) + line.substr(super_end + 1) + "\n" + String("\t").repeat(indent + 1) + "super" + line.substr(super_start + 1, super_end - super_start);
 		}
diff --git a/editor/script_create_dialog.cpp b/editor/script_create_dialog.cpp
index d38ff7af76..8615836ddd 100644
--- a/editor/script_create_dialog.cpp
+++ b/editor/script_create_dialog.cpp
@@ -144,7 +144,7 @@ void ScriptCreateDialog::_notification(int p_what) {
 
 void ScriptCreateDialog::_path_hbox_sorted() {
 	if (is_visible()) {
-		int filename_start_pos = file_path->get_text().rfind("/") + 1;
+		int filename_start_pos = file_path->get_text().rfind_char('/') + 1;
 		int filename_end_pos = file_path->get_text().get_basename().length();
 
 		if (!is_built_in) {
diff --git a/editor/shader_create_dialog.cpp b/editor/shader_create_dialog.cpp
index e1c797633a..33da3dd10c 100644
--- a/editor/shader_create_dialog.cpp
+++ b/editor/shader_create_dialog.cpp
@@ -103,7 +103,7 @@ void ShaderCreateDialog::_update_language_info() {
 
 void ShaderCreateDialog::_path_hbox_sorted() {
 	if (is_visible()) {
-		int filename_start_pos = initial_base_path.rfind("/") + 1;
+		int filename_start_pos = initial_base_path.rfind_char('/') + 1;
 		int filename_end_pos = initial_base_path.length();
 
 		if (!is_built_in) {
diff --git a/main/main.cpp b/main/main.cpp
index 2c41acef8b..340167fe00 100644
--- a/main/main.cpp
+++ b/main/main.cpp
@@ -1598,7 +1598,7 @@ Error Main::setup(const char *execpath, int argc, char *argv[], bool p_second_ph
 		} else if (arg.ends_with("project.godot")) {
 			String path;
 			String file = arg;
-			int sep = MAX(file.rfind("/"), file.rfind("\\"));
+			int sep = MAX(file.rfind_char('/'), file.rfind_char('\\'));
 			if (sep == -1) {
 				path = ".";
 			} else {
@@ -4145,7 +4145,7 @@ int Main::start() {
 						local_game_path = "res://" + local_game_path;
 
 					} else {
-						int sep = local_game_path.rfind("/");
+						int sep = local_game_path.rfind_char('/');
 
 						if (sep == -1) {
 							Ref<DirAccess> da = DirAccess::create(DirAccess::ACCESS_FILESYSTEM);
diff --git a/modules/gdscript/editor/gdscript_docgen.cpp b/modules/gdscript/editor/gdscript_docgen.cpp
index 758887a723..3a5a88d356 100644
--- a/modules/gdscript/editor/gdscript_docgen.cpp
+++ b/modules/gdscript/editor/gdscript_docgen.cpp
@@ -140,7 +140,7 @@ void GDScriptDocGen::_doctype_from_gdtype(const GDType &p_gdtype, String &r_type
 			r_enum = String(p_gdtype.native_type).replace("::", ".");
 			if (r_enum.begins_with("res://")) {
 				r_enum = r_enum.trim_prefix("res://");
-				int dot_pos = r_enum.rfind(".");
+				int dot_pos = r_enum.rfind_char('.');
 				if (dot_pos >= 0) {
 					r_enum = r_enum.left(dot_pos).quote() + r_enum.substr(dot_pos);
 				}
diff --git a/modules/gdscript/editor/gdscript_highlighter.cpp b/modules/gdscript/editor/gdscript_highlighter.cpp
index 0b12f2ff76..629581bd6c 100644
--- a/modules/gdscript/editor/gdscript_highlighter.cpp
+++ b/modules/gdscript/editor/gdscript_highlighter.cpp
@@ -163,7 +163,7 @@ Dictionary GDScriptSyntaxHighlighter::_get_line_syntax_highlighting_impl(int p_l
 							}
 							if (from + end_key_length > line_length) {
 								// If it's key length and there is a '\', dont skip to highlight esc chars.
-								if (str.find("\\", from) >= 0) {
+								if (str.find_char('\\', from) >= 0) {
 									break;
 								}
 							}
@@ -236,7 +236,7 @@ Dictionary GDScriptSyntaxHighlighter::_get_line_syntax_highlighting_impl(int p_l
 						for (; from < line_length; from++) {
 							if (line_length - from < end_key_length) {
 								// Don't break if '\' to highlight esc chars.
-								if (str.find("\\", from) < 0) {
+								if (str.find_char('\\', from) < 0) {
 									break;
 								}
 							}
diff --git a/modules/gdscript/gdscript_editor.cpp b/modules/gdscript/gdscript_editor.cpp
index a29bd1fdb5..d58cd2c3f7 100644
--- a/modules/gdscript/gdscript_editor.cpp
+++ b/modules/gdscript/gdscript_editor.cpp
@@ -3472,7 +3472,7 @@ static void _find_call_arguments(GDScriptParser::CompletionContext &p_context, c
 					}
 					String arg = arg_itr->name;
 					if (arg.contains(":")) {
-						arg = arg.substr(0, arg.find(":"));
+						arg = arg.substr(0, arg.find_char(':'));
 					}
 					method_hint += arg;
 					if (use_type_hint) {
diff --git a/modules/gltf/editor/editor_scene_importer_blend.cpp b/modules/gltf/editor/editor_scene_importer_blend.cpp
index 2db46adef4..5ba9ee3fa6 100644
--- a/modules/gltf/editor/editor_scene_importer_blend.cpp
+++ b/modules/gltf/editor/editor_scene_importer_blend.cpp
@@ -80,7 +80,7 @@ static bool _get_blender_version(const String &p_path, int &r_major, int &r_mino
 	}
 	pipe = pipe.substr(bl);
 	pipe = pipe.replace_first("Blender ", "");
-	int pp = pipe.find(".");
+	int pp = pipe.find_char('.');
 	if (pp == -1) {
 		if (r_err) {
 			*r_err = vformat(TTR("Couldn't extract version information from Blender executable at: %s."), p_path);
@@ -96,7 +96,7 @@ static bool _get_blender_version(const String &p_path, int &r_major, int &r_mino
 		return false;
 	}
 
-	int pp2 = pipe.find(".", pp + 1);
+	int pp2 = pipe.find_char('.', pp + 1);
 	r_minor = pp2 > pp ? pipe.substr(pp + 1, pp2 - pp - 1).to_int() : 0;
 
 	return true;
diff --git a/modules/gltf/gltf_document.cpp b/modules/gltf/gltf_document.cpp
index 7cac61304f..2f36c29ec4 100644
--- a/modules/gltf/gltf_document.cpp
+++ b/modules/gltf/gltf_document.cpp
@@ -689,7 +689,7 @@ void GLTFDocument::_compute_node_heights(Ref<GLTFState> p_state) {
 }
 
 static Vector<uint8_t> _parse_base64_uri(const String &p_uri) {
-	int start = p_uri.find(",");
+	int start = p_uri.find_char(',');
 	ERR_FAIL_COND_V(start == -1, Vector<uint8_t>());
 
 	CharString substr = p_uri.substr(start + 1).ascii();
diff --git a/modules/mono/csharp_script.cpp b/modules/mono/csharp_script.cpp
index 380b401683..ec9c123f8d 100644
--- a/modules/mono/csharp_script.cpp
+++ b/modules/mono/csharp_script.cpp
@@ -2817,7 +2817,7 @@ Ref<Resource> ResourceFormatLoaderCSharpScript::load(const String &p_path, const
 	if (p_path.begins_with("csharp://")) {
 		// This is a virtual path used by generic types, extract the real path.
 		real_path = "res://" + p_path.trim_prefix("csharp://");
-		real_path = real_path.substr(0, real_path.rfind(":"));
+		real_path = real_path.substr(0, real_path.rfind_char(':'));
 	}
 
 	Ref<CSharpScript> scr;
diff --git a/modules/mono/editor/bindings_generator.cpp b/modules/mono/editor/bindings_generator.cpp
index db90ac5a6e..c54d58d6a0 100644
--- a/modules/mono/editor/bindings_generator.cpp
+++ b/modules/mono/editor/bindings_generator.cpp
@@ -190,7 +190,7 @@ String BindingsGenerator::bbcode_to_text(const String &p_bbcode, const TypeInter
 
 	int pos = 0;
 	while (pos < bbcode.length()) {
-		int brk_pos = bbcode.find("[", pos);
+		int brk_pos = bbcode.find_char('[', pos);
 
 		if (brk_pos < 0) {
 			brk_pos = bbcode.length();
@@ -210,7 +210,7 @@ String BindingsGenerator::bbcode_to_text(const String &p_bbcode, const TypeInter
 			break;
 		}
 
-		int brk_end = bbcode.find("]", brk_pos + 1);
+		int brk_end = bbcode.find_char(']', brk_pos + 1);
 
 		if (brk_end == -1) {
 			String text = bbcode.substr(brk_pos, bbcode.length() - brk_pos);
@@ -239,7 +239,7 @@ String BindingsGenerator::bbcode_to_text(const String &p_bbcode, const TypeInter
 			output.append("[");
 			pos = brk_pos + 1;
 		} else if (tag.begins_with("method ") || tag.begins_with("constructor ") || tag.begins_with("operator ") || tag.begins_with("member ") || tag.begins_with("signal ") || tag.begins_with("enum ") || tag.begins_with("constant ") || tag.begins_with("theme_item ") || tag.begins_with("param ")) {
-			const int tag_end = tag.find(" ");
+			const int tag_end = tag.find_char(' ');
 			const String link_tag = tag.substr(0, tag_end);
 			const String link_target = tag.substr(tag_end + 1, tag.length()).lstrip(" ");
 
@@ -385,7 +385,7 @@ String BindingsGenerator::bbcode_to_text(const String &p_bbcode, const TypeInter
 			pos = brk_end + 1;
 			tag_stack.push_front(tag);
 		} else if (tag == "url") {
-			int end = bbcode.find("[", brk_end);
+			int end = bbcode.find_char('[', brk_end);
 			if (end == -1) {
 				end = bbcode.length();
 			}
@@ -403,7 +403,7 @@ String BindingsGenerator::bbcode_to_text(const String &p_bbcode, const TypeInter
 			pos = brk_end + 1;
 			tag_stack.push_front("url");
 		} else if (tag == "img") {
-			int end = bbcode.find("[", brk_end);
+			int end = bbcode.find_char('[', brk_end);
 			if (end == -1) {
 				end = bbcode.length();
 			}
@@ -455,7 +455,7 @@ String BindingsGenerator::bbcode_to_xml(const String &p_bbcode, const TypeInterf
 
 	int pos = 0;
 	while (pos < bbcode.length()) {
-		int brk_pos = bbcode.find("[", pos);
+		int brk_pos = bbcode.find_char('[', pos);
 
 		if (brk_pos < 0) {
 			brk_pos = bbcode.length();
@@ -488,7 +488,7 @@ String BindingsGenerator::bbcode_to_xml(const String &p_bbcode, const TypeInterf
 			break;
 		}
 
-		int brk_end = bbcode.find("]", brk_pos + 1);
+		int brk_end = bbcode.find_char(']', brk_pos + 1);
 
 		if (brk_end == -1) {
 			if (!line_del) {
@@ -551,7 +551,7 @@ String BindingsGenerator::bbcode_to_xml(const String &p_bbcode, const TypeInterf
 			xml_output.append("[");
 			pos = brk_pos + 1;
 		} else if (tag.begins_with("method ") || tag.begins_with("constructor ") || tag.begins_with("operator ") || tag.begins_with("member ") || tag.begins_with("signal ") || tag.begins_with("enum ") || tag.begins_with("constant ") || tag.begins_with("theme_item ") || tag.begins_with("param ")) {
-			const int tag_end = tag.find(" ");
+			const int tag_end = tag.find_char(' ');
 			const String link_tag = tag.substr(0, tag_end);
 			const String link_target = tag.substr(tag_end + 1, tag.length()).lstrip(" ");
 
@@ -696,7 +696,7 @@ String BindingsGenerator::bbcode_to_xml(const String &p_bbcode, const TypeInterf
 			pos = brk_end + 1;
 			tag_stack.push_front(tag);
 		} else if (tag == "code" || tag.begins_with("code ")) {
-			int end = bbcode.find("[", brk_end);
+			int end = bbcode.find_char('[', brk_end);
 			if (end == -1) {
 				end = bbcode.length();
 			}
@@ -751,7 +751,7 @@ String BindingsGenerator::bbcode_to_xml(const String &p_bbcode, const TypeInterf
 			pos = brk_end + 1;
 			tag_stack.push_front(tag);
 		} else if (tag == "url") {
-			int end = bbcode.find("[", brk_end);
+			int end = bbcode.find_char('[', brk_end);
 			if (end == -1) {
 				end = bbcode.length();
 			}
@@ -772,7 +772,7 @@ String BindingsGenerator::bbcode_to_xml(const String &p_bbcode, const TypeInterf
 			pos = brk_end + 1;
 			tag_stack.push_front("url");
 		} else if (tag == "img") {
-			int end = bbcode.find("[", brk_end);
+			int end = bbcode.find_char('[', brk_end);
 			if (end == -1) {
 				end = bbcode.length();
 			}
@@ -1619,7 +1619,7 @@ void BindingsGenerator::_generate_global_constants(StringBuilder &p_output) {
 
 		bool enum_in_static_class = false;
 
-		if (enum_proxy_name.find(".") > 0) {
+		if (enum_proxy_name.find_char('.') > 0) {
 			enum_in_static_class = true;
 			String enum_class_name = enum_proxy_name.get_slicec('.', 0);
 			enum_proxy_name = enum_proxy_name.get_slicec('.', 1);
diff --git a/modules/mono/editor/code_completion.cpp b/modules/mono/editor/code_completion.cpp
index ae914e71ef..94222f3d67 100644
--- a/modules/mono/editor/code_completion.cpp
+++ b/modules/mono/editor/code_completion.cpp
@@ -116,7 +116,7 @@ PackedStringArray get_code_completion(CompletionKind p_kind, const String &p_scr
 					continue;
 				}
 
-				String name = prop.name.substr(prop.name.find("/") + 1, prop.name.length());
+				String name = prop.name.substr(prop.name.find_char('/') + 1, prop.name.length());
 				suggestions.push_back(quoted(name));
 			}
 		} break;
diff --git a/modules/mono/utils/path_utils.cpp b/modules/mono/utils/path_utils.cpp
index ee17a668d7..068ac8b4e1 100644
--- a/modules/mono/utils/path_utils.cpp
+++ b/modules/mono/utils/path_utils.cpp
@@ -212,7 +212,7 @@ String relative_to_impl(const String &p_path, const String &p_relative_to) {
 #ifdef WINDOWS_ENABLED
 String get_drive_letter(const String &p_norm_path) {
 	int idx = p_norm_path.find(":/");
-	if (idx != -1 && idx < p_norm_path.find("/")) {
+	if (idx != -1 && idx < p_norm_path.find_char('/')) {
 		return p_norm_path.substr(0, idx + 1);
 	}
 	return String();
diff --git a/modules/multiplayer/editor/replication_editor.cpp b/modules/multiplayer/editor/replication_editor.cpp
index 8de82ef409..4d5480eebf 100644
--- a/modules/multiplayer/editor/replication_editor.cpp
+++ b/modules/multiplayer/editor/replication_editor.cpp
@@ -375,7 +375,7 @@ void ReplicationEditor::_add_pressed() {
 		return;
 	}
 
-	int idx = np_text.find(":");
+	int idx = np_text.find_char(':');
 	if (idx == -1) {
 		np_text = ".:" + np_text;
 	} else if (idx == 0) {
@@ -554,7 +554,7 @@ void ReplicationEditor::_add_property(const NodePath &p_property, bool p_spawn,
 	Node *root_node = current && !current->get_root_path().is_empty() ? current->get_node(current->get_root_path()) : nullptr;
 	Ref<Texture2D> icon = _get_class_icon(root_node);
 	if (root_node) {
-		String path = prop.substr(0, prop.find(":"));
+		String path = prop.substr(0, prop.find_char(':'));
 		String subpath = prop.substr(path.size());
 		Node *node = root_node->get_node_or_null(path);
 		if (!node) {
diff --git a/modules/svg/image_loader_svg.cpp b/modules/svg/image_loader_svg.cpp
index b9d493b844..1f7d5504b6 100644
--- a/modules/svg/image_loader_svg.cpp
+++ b/modules/svg/image_loader_svg.cpp
@@ -53,7 +53,7 @@ void ImageLoaderSVG::_replace_color_property(const HashMap<Color, Color> &p_colo
 	int pos = r_string.find(p_prefix);
 	while (pos != -1) {
 		pos += prefix_len; // Skip prefix.
-		int end_pos = r_string.find("\"", pos);
+		int end_pos = r_string.find_char('"', pos);
 		ERR_FAIL_COND_MSG(end_pos == -1, vformat("Malformed SVG string after property \"%s\".", p_prefix));
 		const String color_code = r_string.substr(pos, end_pos - pos);
 		if (color_code != "none" && !color_code.begins_with("url(")) {
diff --git a/platform/android/export/export_plugin.cpp b/platform/android/export/export_plugin.cpp
index df3142ecbb..0b506e60d6 100644
--- a/platform/android/export/export_plugin.cpp
+++ b/platform/android/export/export_plugin.cpp
@@ -1564,7 +1564,7 @@ void EditorExportPlatformAndroid::_fix_resources(const Ref<EditorExportPreset> &
 				str = get_project_name(package_name);
 
 			} else {
-				String lang = str.substr(str.rfind("-") + 1, str.length()).replace("-", "_");
+				String lang = str.substr(str.rfind_char('-') + 1, str.length()).replace("-", "_");
 				if (appnames.has(lang)) {
 					str = appnames[lang];
 				} else {
diff --git a/platform/macos/export/export_plugin.cpp b/platform/macos/export/export_plugin.cpp
index bf5645d9a6..b9f9d8d613 100644
--- a/platform/macos/export/export_plugin.cpp
+++ b/platform/macos/export/export_plugin.cpp
@@ -970,7 +970,7 @@ Error EditorExportPlatformMacOS::_notarize(const Ref<EditorExportPreset> &p_pres
 				return Error::FAILED;
 			} else {
 				print_verbose("rcodesign (" + p_path + "):\n" + str);
-				int next_nl = str.find("\n", rq_offset);
+				int next_nl = str.find_char('\n', rq_offset);
 				String request_uuid = (next_nl == -1) ? str.substr(rq_offset + 23, -1) : str.substr(rq_offset + 23, next_nl - rq_offset - 23);
 				add_message(EXPORT_MESSAGE_INFO, TTR("Notarization"), vformat(TTR("Notarization request UUID: \"%s\""), request_uuid));
 				add_message(EXPORT_MESSAGE_INFO, TTR("Notarization"), TTR("The notarization process generally takes less than an hour."));
@@ -1054,7 +1054,7 @@ Error EditorExportPlatformMacOS::_notarize(const Ref<EditorExportPreset> &p_pres
 				return Error::FAILED;
 			} else {
 				print_verbose("notarytool (" + p_path + "):\n" + str);
-				int next_nl = str.find("\n", rq_offset);
+				int next_nl = str.find_char('\n', rq_offset);
 				String request_uuid = (next_nl == -1) ? str.substr(rq_offset + 4, -1) : str.substr(rq_offset + 4, next_nl - rq_offset - 4);
 				add_message(EXPORT_MESSAGE_INFO, TTR("Notarization"), vformat(TTR("Notarization request UUID: \"%s\""), request_uuid));
 				add_message(EXPORT_MESSAGE_INFO, TTR("Notarization"), TTR("The notarization process generally takes less than an hour."));
diff --git a/platform/web/api/web_tools_editor_plugin.cpp b/platform/web/api/web_tools_editor_plugin.cpp
index d39773bde2..61801372ba 100644
--- a/platform/web/api/web_tools_editor_plugin.cpp
+++ b/platform/web/api/web_tools_editor_plugin.cpp
@@ -80,7 +80,7 @@ void WebToolsEditorPlugin::_download_zip() {
 	const String output_path = String("/tmp").path_join(output_name);
 
 	zipFile zip = zipOpen2(output_path.utf8().get_data(), APPEND_STATUS_CREATE, nullptr, &io);
-	const String base_path = resource_path.substr(0, resource_path.rfind("/")) + "/";
+	const String base_path = resource_path.substr(0, resource_path.rfind_char('/')) + "/";
 	_zip_recursive(resource_path, base_path, zip);
 	zipClose(zip, nullptr);
 	{
diff --git a/scene/gui/file_dialog.cpp b/scene/gui/file_dialog.cpp
index 158155a51c..e601f16843 100644
--- a/scene/gui/file_dialog.cpp
+++ b/scene/gui/file_dialog.cpp
@@ -50,7 +50,7 @@ void FileDialog::popup_file_dialog() {
 }
 
 void FileDialog::_focus_file_text() {
-	int lp = file->get_text().rfind(".");
+	int lp = file->get_text().rfind_char('.');
 	if (lp != -1) {
 		file->select(0, lp);
 		if (file->is_inside_tree() && !is_part_of_edited_scene()) {
@@ -1001,7 +1001,7 @@ void FileDialog::set_current_path(const String &p_path) {
 	if (!p_path.size()) {
 		return;
 	}
-	int pos = MAX(p_path.rfind("/"), p_path.rfind("\\"));
+	int pos = MAX(p_path.rfind_char('/'), p_path.rfind_char('\\'));
 	if (pos == -1) {
 		set_current_file(p_path);
 	} else {
diff --git a/scene/gui/rich_text_label.cpp b/scene/gui/rich_text_label.cpp
index 26141663c1..a349d50236 100644
--- a/scene/gui/rich_text_label.cpp
+++ b/scene/gui/rich_text_label.cpp
@@ -4845,7 +4845,7 @@ void RichTextLabel::append_text(const String &p_bbcode) {
 				String tooltip;
 				bool size_in_percent = false;
 				if (!bbcode_value.is_empty()) {
-					int sep = bbcode_value.find("x");
+					int sep = bbcode_value.find_char('x');
 					if (sep == -1) {
 						width = bbcode_value.to_int();
 					} else {
diff --git a/scene/main/http_request.cpp b/scene/main/http_request.cpp
index 8526611093..986bd87af2 100644
--- a/scene/main/http_request.cpp
+++ b/scene/main/http_request.cpp
@@ -87,7 +87,7 @@ String HTTPRequest::get_header_value(const PackedStringArray &p_headers, const S
 
 	String lowwer_case_header_name = p_header_name.to_lower();
 	for (int i = 0; i < p_headers.size(); i++) {
-		if (p_headers[i].find(":") > 0) {
+		if (p_headers[i].find_char(':') > 0) {
 			Vector<String> parts = p_headers[i].split(":", false, 1);
 			if (parts.size() > 1 && parts[0].strip_edges().to_lower() == lowwer_case_header_name) {
 				value = parts[1].strip_edges();
diff --git a/scene/property_utils.cpp b/scene/property_utils.cpp
index f068e34beb..9cae7d2a3a 100644
--- a/scene/property_utils.cpp
+++ b/scene/property_utils.cpp
@@ -182,7 +182,7 @@ Variant PropertyUtils::get_property_default_value(const Object *p_object, const
 			// Heuristically check if this is a synthetic property (whatever/0, whatever/1, etc.)
 			// because they are not in the class DB yet must have a default (null).
 			String prop_str = String(p_property);
-			int p = prop_str.rfind("/");
+			int p = prop_str.rfind_char('/');
 			if (p != -1 && p < prop_str.length() - 1) {
 				bool all_digits = true;
 				for (int i = p + 1; i < prop_str.length(); i++) {
diff --git a/scene/resources/font.cpp b/scene/resources/font.cpp
index a4677d917d..ae70443e6a 100644
--- a/scene/resources/font.cpp
+++ b/scene/resources/font.cpp
@@ -1734,7 +1734,7 @@ Error FontFile::_load_bitmap_font(const String &p_path, List<String> *r_image_fi
 		while (true) {
 			String line = f->get_line();
 
-			int delimiter = line.find(" ");
+			int delimiter = line.find_char(' ');
 			String type = line.substr(0, delimiter);
 			int pos = delimiter + 1;
 			HashMap<String, String> keys;
@@ -1744,7 +1744,7 @@ Error FontFile::_load_bitmap_font(const String &p_path, List<String> *r_image_fi
 			}
 
 			while (pos < line.size()) {
-				int eq = line.find("=", pos);
+				int eq = line.find_char('=', pos);
 				if (eq == -1) {
 					break;
 				}
@@ -1752,14 +1752,14 @@ Error FontFile::_load_bitmap_font(const String &p_path, List<String> *r_image_fi
 				int end = -1;
 				String value;
 				if (line[eq + 1] == '"') {
-					end = line.find("\"", eq + 2);
+					end = line.find_char('"', eq + 2);
 					if (end == -1) {
 						break;
 					}
 					value = line.substr(eq + 2, end - 1 - eq - 1);
 					pos = end + 1;
 				} else {
-					end = line.find(" ", eq + 1);
+					end = line.find_char(' ', eq + 1);
 					if (end == -1) {
 						end = line.size();
 					}
diff --git a/scene/resources/mesh.cpp b/scene/resources/mesh.cpp
index b0353b4f2c..8c0e087902 100644
--- a/scene/resources/mesh.cpp
+++ b/scene/resources/mesh.cpp
@@ -1315,7 +1315,7 @@ bool ArrayMesh::_set(const StringName &p_name, const Variant &p_value) {
 	String sname = p_name;
 
 	if (sname.begins_with("surface_")) {
-		int sl = sname.find("/");
+		int sl = sname.find_char('/');
 		if (sl == -1) {
 			return false;
 		}
@@ -1708,7 +1708,7 @@ bool ArrayMesh::_get(const StringName &p_name, Variant &r_ret) const {
 
 	String sname = p_name;
 	if (sname.begins_with("surface_")) {
-		int sl = sname.find("/");
+		int sl = sname.find_char('/');
 		if (sl == -1) {
 			return false;
 		}
diff --git a/scene/resources/packed_scene.cpp b/scene/resources/packed_scene.cpp
index 809a77a487..d7036fd6d5 100644
--- a/scene/resources/packed_scene.cpp
+++ b/scene/resources/packed_scene.cpp
@@ -822,10 +822,10 @@ Error SceneState::_parse_node(Node *p_owner, Node *p_node, int p_parent_idx, Has
 				value = missing_resource_properties[E.name];
 			}
 		} else if (E.type == Variant::ARRAY && E.hint == PROPERTY_HINT_TYPE_STRING) {
-			int hint_subtype_separator = E.hint_string.find(":");
+			int hint_subtype_separator = E.hint_string.find_char(':');
 			if (hint_subtype_separator >= 0) {
 				String subtype_string = E.hint_string.substr(0, hint_subtype_separator);
-				int slash_pos = subtype_string.find("/");
+				int slash_pos = subtype_string.find_char('/');
 				PropertyHint subtype_hint = PropertyHint::PROPERTY_HINT_NONE;
 				if (slash_pos >= 0) {
 					subtype_hint = PropertyHint(subtype_string.get_slice("/", 1).to_int());
@@ -851,11 +851,11 @@ Error SceneState::_parse_node(Node *p_owner, Node *p_node, int p_parent_idx, Has
 				}
 			}
 		} else if (E.type == Variant::DICTIONARY && E.hint == PROPERTY_HINT_TYPE_STRING) {
-			int key_value_separator = E.hint_string.find(";");
+			int key_value_separator = E.hint_string.find_char(';');
 			if (key_value_separator >= 0) {
-				int key_subtype_separator = E.hint_string.find(":");
+				int key_subtype_separator = E.hint_string.find_char(':');
 				String key_subtype_string = E.hint_string.substr(0, key_subtype_separator);
-				int key_slash_pos = key_subtype_string.find("/");
+				int key_slash_pos = key_subtype_string.find_char('/');
 				PropertyHint key_subtype_hint = PropertyHint::PROPERTY_HINT_NONE;
 				if (key_slash_pos >= 0) {
 					key_subtype_hint = PropertyHint(key_subtype_string.get_slice("/", 1).to_int());
@@ -864,9 +864,9 @@ Error SceneState::_parse_node(Node *p_owner, Node *p_node, int p_parent_idx, Has
 				Variant::Type key_subtype = Variant::Type(key_subtype_string.to_int());
 				bool convert_key = key_subtype == Variant::OBJECT && key_subtype_hint == PROPERTY_HINT_NODE_TYPE;
 
-				int value_subtype_separator = E.hint_string.find(":", key_value_separator) - (key_value_separator + 1);
+				int value_subtype_separator = E.hint_string.find_char(':', key_value_separator) - (key_value_separator + 1);
 				String value_subtype_string = E.hint_string.substr(key_value_separator + 1, value_subtype_separator);
-				int value_slash_pos = value_subtype_string.find("/");
+				int value_slash_pos = value_subtype_string.find_char('/');
 				PropertyHint value_subtype_hint = PropertyHint::PROPERTY_HINT_NONE;
 				if (value_slash_pos >= 0) {
 					value_subtype_hint = PropertyHint(value_subtype_string.get_slice("/", 1).to_int());
diff --git a/scene/resources/resource_format_text.cpp b/scene/resources/resource_format_text.cpp
index 6e03fe25c9..03f0e107e4 100644
--- a/scene/resources/resource_format_text.cpp
+++ b/scene/resources/resource_format_text.cpp
@@ -1782,7 +1782,7 @@ Error ResourceFormatSaverTextInstance::save(const String &p_path, const Ref<Reso
 	for (KeyValue<Ref<Resource>, String> &E : external_resources) {
 		String cached_id = E.key->get_id_for_path(local_path);
 		if (cached_id.is_empty() || cached_ids_found.has(cached_id)) {
-			int sep_pos = E.value.find("_");
+			int sep_pos = E.value.find_char('_');
 			if (sep_pos != -1) {
 				E.value = E.value.substr(0, sep_pos + 1); // Keep the order found, for improved thread loading performance.
 			} else {
diff --git a/scene/resources/syntax_highlighter.cpp b/scene/resources/syntax_highlighter.cpp
index da90ba1ef2..4bc03a049a 100644
--- a/scene/resources/syntax_highlighter.cpp
+++ b/scene/resources/syntax_highlighter.cpp
@@ -205,7 +205,7 @@ Dictionary CodeHighlighter::_get_line_syntax_highlighting_impl(int p_line) {
 						if (end_key_length == 0 || color_regions[c].line_only || from + end_key_length > line_length) {
 							if (from + end_key_length > line_length && (color_regions[in_region].start_key == "\"" || color_regions[in_region].start_key == "\'")) {
 								// If it's key length and there is a '\', dont skip to highlight esc chars.
-								if (str.find("\\", from) >= 0) {
+								if (str.find_char('\\', from) >= 0) {
 									break;
 								}
 							}
@@ -242,7 +242,7 @@ Dictionary CodeHighlighter::_get_line_syntax_highlighting_impl(int p_line) {
 					for (; from < line_length; from++) {
 						if (line_length - from < end_key_length) {
 							// Don't break if '\' to highlight esc chars.
-							if (!is_string || str.find("\\", from) < 0) {
+							if (!is_string || str.find_char('\\', from) < 0) {
 								break;
 							}
 						}