PAM-Modules
	A Collection of Modules for PAM	Sergey Poznyakoff

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4.1 Using pam_regex to control access.

To control access depending on supplied user name, two options are provided. The option regex introduces a regular expression with which to compare a user name:

regex=expression

Compare user name with expression. By default, extended regular expressions with case-sensitive matching are used, but this can be changed using other options (see below).

When this option is used, pam_regex allows only login attempts with user names that match expression. The sense command line option is provided to control that behavior:

sense={allow|deny}

What to do if the user name matches the expression. The value ‘allow’ means to return PAM_SUCCESS, ‘deny’ means to return PAM_AUTH_ERR. Default is ‘allow’.