KSES: Optimize PCRE pattern detecting numeric character references.

Merges [61882] to the 6.9 branch.
Props dmsnell, xknown, johnbillion.



git-svn-id: https://develop.svn.wordpress.org/branches/6.9@61893 602fd350-edb4-49c9-b593-d223f7449a82

Author: audrasjb

src/wp-includes/kses.php

@@ -2201,8 +2201,8 @@ function wp_kses_normalize_entities( $content, $context = 'html' ) {
 	 *
 	 * Here, each input is normalized to an appropriate output.
 	 */
-	$content = preg_replace_callback( '/&#(0*[0-9]{1,7});/', 'wp_kses_normalize_entities2', $content );
-	$content = preg_replace_callback( '/&#[Xx](0*[0-9A-Fa-f]{1,6});/', 'wp_kses_normalize_entities3', $content );
+	$content = preg_replace_callback( '/&#(0*[1-9][0-9]{0,6});/', 'wp_kses_normalize_entities2', $content );
+	$content = preg_replace_callback( '/&#[Xx](0*[1-9A-Fa-f][0-9A-Fa-f]{0,5});/', 'wp_kses_normalize_entities3', $content );
 	if ( 'xml' === $context ) {
 		$content = preg_replace_callback( '/&([A-Za-z]{2,8}[0-9]{0,2});/', 'wp_kses_xml_named_entities', $content );
 	} else {