From 6096e1d2e5108e32a281973bde91cbcdfa216011 Mon Sep 17 00:00:00 2001
From: nerrad <nerrad@git.wordpress.org>
Date: Tue, 26 Aug 2025 18:22:32 +0000
Subject: [PATCH] HTML API: Reliably parse HTML in get_url_in_content()
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As part of a larger effort in #63694, this utlizes `WP_HTML_Tag_Processor` instead of regex to parse the string passed into `get_url_in_content`.

As a benefit this also decodes the URL whereas the previous code didn’t, so strings like `http&#x3A;//` will be properly decoded as `http://`.

Developed in: https://github.com/WordPress/wordpress-develop/pull/9272
Discussed in: https://core.trac.wordpress.org/ticket/63694

Props dmsnell, jonsurrell, nerrad.
Fixes #63694.
Built from https://develop.svn.wordpress.org/trunk@60665


git-svn-id: http://core.svn.wordpress.org/trunk@60001 1a063a9b-81f0-0310-95a4-ce76da25c4cd
---
 wp-includes/formatting.php | 12 ++++++++----
 wp-includes/version.php    |  2 +-
 2 files changed, 9 insertions(+), 5 deletions(-)

diff --git a/wp-includes/formatting.php b/wp-includes/formatting.php
index 7f69321a71..72fcb4e554 100644
--- a/wp-includes/formatting.php
+++ b/wp-includes/formatting.php
@@ -5978,16 +5978,20 @@ function wp_unslash( $value ) {
  *
  * @since 3.6.0
  *
- * @param string $content A string which might contain a URL.
- * @return string|false The found URL.
+ * @param string $content A string which might contain an `A` element with a non-empty `href` attribute.
+ * @return string|false Database-escaped URL via {@see esc_url()} if found, otherwise `false`.
  */
 function get_url_in_content( $content ) {
 	if ( empty( $content ) ) {
 		return false;
 	}
 
-	if ( preg_match( '/<a\s[^>]*?href=([\'"])(.+?)\1/is', $content, $matches ) ) {
-		return sanitize_url( $matches[2] );
+	$processor = new WP_HTML_Tag_Processor( $content );
+	while ( $processor->next_tag( 'A' ) ) {
+		$href = $processor->get_attribute( 'href' );
+		if ( is_string( $href ) && ! empty( $href ) ) {
+			return sanitize_url( $href );
+		}
 	}
 
 	return false;
diff --git a/wp-includes/version.php b/wp-includes/version.php
index 7a0ae041ff..332a838908 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '6.9-alpha-60664';
+$wp_version = '6.9-alpha-60665';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.