Portable Perl-compatible regular expressions for Common Lisp
CL-PPCRE is a portable regular expression library for Common Lisp which has the following features: * It is compatible with Perl. * It is pretty fast. * It is portable between ANSI-compliant Common Lisp implementations. * It is thread-safe. * In addition to specifying regular expressions as strings like in Perl you can also use S-expressions. * It comes with a BSD-style license so you can basically do with it whatever you want.