/**
* Returns array entries that match the pattern.
* @param array
* @param string
* @param int
* @return array
*/
public static function grep(array $arr, $pattern, $flags = 0)
{
NDebugger::tryError();
$res = preg_grep($pattern, $arr, $flags);
NStrings::catchPregError($pattern);
return $res;
}