private function extractClass($regEx, $classContent)
    {
        preg_match($regEx, $classContent, $matches);
        if (isset($matches[1]) && class_exists($matches[1])) {
            return $matches[1];
        }

        return;
    }
private function extractClass($regEx, $classContent)
    {
        preg_match($regEx, $classContent, $matches);
        if (isset($matches[1]) && class_exists($matches[1])) {
            return $matches[1];
        }

        return;
    }
private function extractClass ( $ regEx , $ classContent ) { preg_match ( $ regEx , $ classContent , $ matches ) ; if ( isset ( $ matches [ 1 ] ) && class_exists ( $ matches [ 1 ] ) ) { return $ matches [ 1 ] ; } return ; }
Extract class usage from origin class content using regular expresion.

@param $regEx
@param $classContent
Extract class usage from origin class content using regular expresion .