Flow\Helper::replace PHP Method

    public static function replace($obj = null, $search = '', $replace = '', $regex = false)
    {
        if ($regex) {
            return preg_replace($search, $replace, strval($obj));
        } else {
            return str_replace($search, $replace, strval($obj));
        }
    }

 public function test_replace()
 {
     $this->assertEquals('barbaric', Helper::replace('foobaric', 'foo', 'bar'));
     $this->assertEquals('vaporic', Helper::replace('foobaric', '/foobar/', 'vapor', true));
 }