Small adjustment

I want to create some PHP validation for my Name input box on my form

For my Username input box, i have

[code=php]if (preg_match(‘/^[a-z0-9_]{5,20}$/i’, $username))[/code]

This checks that the username is 5 – 20 characters in length and that a-z 0-9 _ characters are only used

How do i create a validation similar to above that only checks that the name input box is 1-20 characters in length (any characters can be used)

Thanks

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