Check username for invalid characters

Posted by MILESMIBALERR on Stack Overflow See other posts from Stack Overflow or by MILESMIBALERR
Published on 2010-05-31T00:26:09Z Indexed on 2010/05/31 0:32 UTC
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php

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username

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restrict

How do you check if a username contains invalid characters?

I want to restrict each users username with PHP to having numbers, letters, and underscores.

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