From ec9060cc9912b0629117b4569336dd1a23bc4f53 Mon Sep 17 00:00:00 2001
From: Ryan Boren <ryan@git.wordpress.org>
Date: Wed, 12 Oct 2011 20:34:14 +0000
Subject: [PATCH] Allow 0 - 9 in tag_escape(). Props sirzooro. fixes #18765

git-svn-id: https://develop.svn.wordpress.org/trunk@18955 602fd350-edb4-49c9-b593-d223f7449a82
---
 wp-includes/formatting.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/wp-includes/formatting.php b/wp-includes/formatting.php
index cbf8b4ff30..f3afcfaa00 100644
--- a/wp-includes/formatting.php
+++ b/wp-includes/formatting.php
@@ -2440,7 +2440,7 @@ function esc_textarea( $text ) {
  * @return string
  */
 function tag_escape($tag_name) {
-	$safe_tag = strtolower( preg_replace('/[^a-zA-Z_:]/', '', $tag_name) );
+	$safe_tag = strtolower( preg_replace('/[^a-zA-Z0-9_:]/', '', $tag_name) );
 	return apply_filters('tag_escape', $safe_tag, $tag_name);
 }