Need help with code (easy)

From: Date: Thu, 26 Oct 2000 00:23:13 +0000
Subject: Need help with code (easy)
Groups: php.general 
Request: Send a blank email to php-general+get-21947@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... No spaces symbles How do I do this?

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