Add more pattern types

Problem/Motivation

The module currently supports only PCRE regular expressions, but in some cases, it would be preferable to use more simpler regular expressions, for example admin% instead of ^admin.*, or plain strings, for example admin instead of ^admin$.

Proposed resolution

Create and use plugins for the supported regular expressions, one for PCRE regular expressions, and one for regular expressions similar to the ones accepted by MySQL LIKE.