src/Primitive/String/String.php
public function is($pattern)
    {
        return (bool) Str::matches($this->retrieveValue($pattern), $this->string);
    }
public function is($pattern)
    {
        return (bool) Str::matches($this->retrieveValue($pattern), $this->string);
    }
Return true if String matches the supplied pattern, false otherwise.

@param string|StringContract $pattern
@return bool