$re = '/(?<="Assigned Workgroup" in \()["?\w"?|,]*\"(Business Service Management)/m';
$str = 'project in (KISHORE_TEST, "Business Service Management") AND "Assigned Workgroup" in (KISHORE_TEST,"Business Service Management", "Account","BSM Automation") OR "Workgroup" in ("BSM Automation") OR "Assigned Workgroup" in ("Business Service Management","BSM Automation") AND "Assigned Workgroup" in ("KISHORE_TEST","Business Service Management", "Account","BSM Automation") OR "Assigned Workgroup" in ("BSM Automation") and team = "Business Service Management"';
preg_match_all($re, $str, $matches, PREG_SET_ORDER, 0);
// Print the entire match result
var_dump($matches);
Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for PHP, please visit: http://php.net/manual/en/ref.pcre.php