I need some code help.

From: Date: Wed, 25 Oct 2000 21:49:16 +0000
Subject: I need some code help.
Groups: php.general 
Request: Send a blank email to php-general+get-21911@lists.php.net to get a copy of this message
I need a section of code that will verify a username and password. I only want it to contain A_Z a_z and 0_1 and underscore... How do I do this?

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