re
The re package is a small, portable, lightweight, and quick, regular expression library for Common Lisp. It is a non-recursive, backtracing VM. The syntax is similar to Lua-style pattern patching (found here), but has added support for additional regex features. It's certainly not the fastest, but is very easy to understand and extend.

Depends on: parse

Repository: https://github.com/massung/re

License: Apache 2