Need help with REGEX

I tested it using:
http://www.solmetra.com/scripts/regex/index.php

And it only returns true if it matches, but altering the file name to be sometime like asdsf.php it will return false - this whether or not the dots are escaped. But if you want to evade that issue entirely, why not use basename($_SERVER['PHP_SELF'], ".php")

AFter more testing, I think I would suggest for you to also echo basename($_SERVER['PHP_SELF']) to make sure it is resulting to what you want it to be.