| IsAscii | Tests if a string contains only ASCII characters. |
| IsBlank | Tests if a string contains only blank characters. |
| IsDigit | Tests if a string contains only digits. |
| IsHexa | Tests if a string contains only hexadecimal digits. |
| IsLCase | Tests if a string contains only lowercase letters. |
| IsLetter | Tests if a string contains only letters. |
| IsPunct | Tests if a string contains only printable non-alphanumeric characters. |
| IsSpace | Tests if a string contains only space characters. |
| IsUCase | Tests if a string contains only uppercase letters. |