# Alpha

- `v::alpha()`
- `v::alpha(string $additionalChars)`

This is similar to v::alnum(), but it doesn't allow numbers. It also
accepts empty values and whitespace, so use `v::notEmpty()` and
`v::noWhitespace()` when appropriate.

See also:

  * [Alnum](Alnum.md)
  * [Digit](Digit.md)
  * [Consonant](Consonant.md)
  * [Vowel](Vowel.md)
