JBZoo\PHPUnit\FilterTest::testDigets PHP Method

    public function testDigets()
    {
        $string = " 0 1 a2b 3c!@#\$%^&*()-= <>\t";
        isSame('0123', Filter::_($string, 'digits'));
        isSame('abc', Filter::_($string, 'alpha'));
        isSame('01a2b3c', Filter::_($string, 'alphanum'));
    }