From d3932e23882446f934c8a44d2f0d55121bd27771 Mon Sep 17 00:00:00 2001
From: azaozz <azaozz@1a063a9b-81f0-0310-95a4-ce76da25c4cd>
Date: Sun, 8 Feb 2009 16:08:02 +0000
Subject: [PATCH] Reduce backtracking in autop, fixes #6877, see #8553

git-svn-id: http://svn.automattic.com/wordpress/trunk@10527 1a063a9b-81f0-0310-95a4-ce76da25c4cd
---
 wp-includes/formatting.php | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/wp-includes/formatting.php b/wp-includes/formatting.php
index 4aaa7ca47f..c730149891 100644
--- a/wp-includes/formatting.php
+++ b/wp-includes/formatting.php
@@ -131,9 +131,8 @@ function wpautop($pee, $br = 1) {
 	$pee = '';
 	foreach ( $pees as $tinkle )
 		$pee .= '<p>' . trim($tinkle, "\n") . "</p>\n";
-	$pee = preg_replace('|<p>\s*?</p>|', '', $pee); // under certain strange conditions it could create a P of entirely whitespace
-	$pee = preg_replace('!<p>([^<]+)\s*?(</(?:div|address|form)[^>]*>)!', "<p>$1</p>$2", $pee);
-	$pee = preg_replace( '|<p>|', "$1<p>", $pee );
+	$pee = preg_replace('|<p>\s*</p>|', '', $pee); // under certain strange conditions it could create a P of entirely whitespace
+	$pee = preg_replace('!<p>([^<]+)</(div|address|form)>!', "<p>$1</p></$2>", $pee);
 	$pee = preg_replace('!<p>\s*(</?' . $allblocks . '[^>]*>)\s*</p>!', "$1", $pee); // don't pee all over a tag
 	$pee = preg_replace("|<p>(<li.+?)</p>|", "$1", $pee); // problem with nested lists
 	$pee = preg_replace('|<p><blockquote([^>]*)>|i', "<blockquote$1><p>", $pee);
@@ -148,7 +147,7 @@ function wpautop($pee, $br = 1) {
 	$pee = preg_replace('!(</?' . $allblocks . '[^>]*>)\s*<br />!', "$1", $pee);
 	$pee = preg_replace('!<br />(\s*</?(?:p|li|div|dl|dd|dt|th|pre|td|ul|ol)[^>]*>)!', '$1', $pee);
 	if (strpos($pee, '<pre') !== false)
-		$pee = preg_replace_callback('!(<pre.*?>)(.*?)</pre>!is', 'clean_pre', $pee );
+		$pee = preg_replace_callback('!(<pre[^>]*>)(.*?)</pre>!is', 'clean_pre', $pee );
 	$pee = preg_replace( "|\n</p>$|", '</p>', $pee );
 	$pee = preg_replace('/<p>\s*?(' . get_shortcode_regex() . ')\s*<\/p>/s', '$1', $pee); // don't auto-p wrap shortcodes that stand alone