R

regex

Rosie Pattern Language (RPL) and the Rosie Pattern Engine, including librosie, CLI, REPL, and standard pattern library.

Password generator with a regular-expression-like syntax. https://passgen.it/

A simple and efficient regular expression implementation

advanced regular expressions for python -> extending the re module by Matthew Barnett (@mrabarnett)

pipeable command line tool that interpolates and mutates color values and converts between different color formats