Revert "Improve handling of nested tags in it_html::sanitize": getting "Exceeded pcre.backtrack_limit of 1000000 bytes"

This reverts commit b484fab88a9229f7c87ea053564d0d8d3d2a565d.

1 files changed, 3 insertions, 7 deletions

diff --git a/it_html.class b/it_html.class
index effe920..9780d5d 100644
--- a/it_html.class
+++ b/it_html.class
@@ -408,15 +408,11 @@ static function sanitize($html)
 	$html = it::replace(array('[\0\s]+' => " "), $html);	# \s also matches \r and \n
 	$urlpattern = 'https?://[^">]+';
 
-	if ($tag = it::match('(<(div|p|ol|ul|li|i|b|strong|h[1-6])\b[^>]*>((?:(?!</?\2\b).|(?R))*?)</\2>)', $html, ['offset_capture' => 1]))
+	if ($tag = it::match("(.*?)<(div|p|ol|ul|li|i|b|strong|h[1-6])\b[^>]*>(.*?)</\\2>(.*)", $html))
 	{
 		# Simple tags with content, no attributes kept
-		$offset = $tag[0][1];
-		$length = strlen($tag[0][0]);
-		$head = substr($html, 0, $offset);
-		$tail = substr($html, $offset + $length);
-		$content = $tag[2][0];
-		$tagname = strtolower($tag[1][0]);
+		list($head, $tagname, $content, $tail) = $tag;
+		$tagname = strtolower($tagname);
 		$result .= it_html::sanitize($head) . "<$tagname>" . it_html::sanitize($content) . "</$tagname>" . it_html::sanitize($tail);
 	}
 	else if ($tag = it::match('(.*)<a\b[^>]+?\bhref\s*=\s*"(' . $urlpattern . ')"[^>]*?>(.*?)</a>(.*)', $html))