View difference between Paste ID: GszXSXnZ and 8VzpG3XY

-function pm_remove_emojis($regex) {
+function pm_remove_emojis_from_slugs( $str ) {
-	$regex = str_replace('[^', '(%f0%9f%[\w]{2}%[\w]{2}|[^', $regex);
+	// Replace hexadecimal sequences with their corresponding Unicode characters
-	$regex = str_replace(']/ui', '])/ui', $regex);
+	$str = preg_replace_callback( '/x([0-9a-fA-F]{4,6})/i', function ( $matches ) {
 		// Convert the hex to decimal, then to the corresponding Unicode character
-	return $regex;
+		return mb_convert_encoding( pack( 'H*', $matches[1] ), 'UTF-8', 'UCS-4BE' );
 	}, $str );
-add_filter('permalink_manager_sanitize_regex', 'pm_remove_emojis', 1);
+
 	// Remove remaining emojis using a regular expression
 	$str = preg_replace( '/[\x{1F600}-\x{1F64F}\x{1F300}-\x{1F5FF}\x{1F900}-\x{1F9FF}\x{1F1E0}-\x{1F1FF}]/u', '', $str );
 
 	// Remove widow & duplicated slashes
     $clean = preg_replace( '|-+|', '-', $str );
 	$clean = preg_replace( '/([-]*[\/]+[-]*)/', '/', $clean );
 	$clean = preg_replace( '/([\/]+)/', '/', $clean );
 
 	// Trim slashes, dashes and whitespaces
 	return trim( $clean, " /-" );
 }
 add_filter('wp_unique_post_slug', 'pm_remove_emojis_from_slugs', 100);