PAM-Modules
	A Collection of Modules for PAM	Sergey Poznyakoff

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4 Authentication using regular expressions.

The module pam_regex is a general-purpose tool for authentication using regular expressions. You can use it, for example, to allow or deny access depending on whether the user name matches a given regular expression. Another possible use is to modify user names following a predefined pattern (as in sed), to supply modules that follow it in the PAM stack with a normalized user name.

As a quick start example, the following pam.conf entry forbids access for any user names that look like email addresses:

httpd auth  required  pam_regex.so sense=deny regex=.*@.*

Here, the argument regex supplies a regular expression to match against, and sense=deny states that any name matching this expression must be denied.