makes extraire_attribut do less backtracking

ecrire/inc/filtres.php

@@ -1191,7 +1191,7 @@ function extraire_tag($texte, $tag) {
 function extraire_attribut($balise, $attribut, $complet = false) {
 	if (preg_match(
 //	',(.*?<[^>]*)(\s'.$attribut.'=\s*([\'"]?)([^\\3]*?)\\3)([^>]*>.*),isS',
-	',(.*?<(?:\s*\w+(?:=(?:"[^"]*?"|\'[^\']*?\'|[^\'"]\S*))?)*)\s*(\s'.$attribut.'(?:=\s*("[^"]*?"|\'[^\']*?\'|[^\'"]\S*))?)()([^>]*>.*),isS',
+	',(.*?<(?:\s*+\w++(?:=(?:"[^"]*"|\'[^\']*\'|[^\'"]\S*))?)*?)(\s+'.$attribut.'(?:=\s*("[^"]*"|\'[^\']*\'|[^\'"]\S*))?)()([^>]*>.*),isS',
 	$balise, $r)) {
 		if ($r[3][0] == '"' || $r[3][0] == "'") {
 			$r[4] = substr($r[3], 1, -1);