Merge pull request #1809 from juzser/dev-master

Update the regexp to avoid catastrophic backtracking

Author: troosan

src/PhpWord/TemplateProcessor.php

@@ -798,7 +798,7 @@ public function cloneBlock($blockname, $clones = 1, $replace = true, $indexVaria
         $xmlBlock = null;
         $matches = array();
         preg_match(
-            '/(<\?xml.*)(<w:p\b.*>\${' . $blockname . '}<\/w:.*?p>)(.*)(<w:p\b.*\${\/' . $blockname . '}<\/w:.*?p>)/is',
+            '/(.*((?s)<w:p\b(?:(?!<w:p\b).)*?\${' . $blockname . '}<\/w:.*?p>))(.*)((?s)<w:p\b(?:(?!<w:p\b).)[^$]*?\${\/' . $blockname . '}<\/w:.*?p>)/is',
             $this->tempDocumentMainPart,
             $matches
         );