respect-validation/docs/Alnum.md
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# Alnum
- `v::alnum()`
- `v::alnum(string $additionalChars)`
Validates alphanumeric characters from a-Z and 0-9.
```php
v::alnum()->validate('foo 123'); // true
```
A parameter for extra characters can be used:
```php
v::alnum('-')->validate('foo - 123'); // true
```
This validator allows whitespace, if you want to
remove them add `->noWhitespace()` to the chain:
```php
v::alnum()->noWhitespace()->validate('foo 123'); // false
```
You can restrict case using the `->lowercase()` and
`->uppercase()` validators:
```php
v::alnum()->uppercase()->validate('aaa'); // false
```
Message template for this validator includes `{{additionalChars}}` as
the string of extra chars passed as the parameter.
***
See also:
* [Alpha](Alpha.md)
* [Digit](Digit.md)
* [Consonant](Consonant.md)
* [Vowel](Vowel.md)