I would recommend re-implementing this if you plan on using it for anything yourself. The approach in this library is a poorly-informed implementation based on parser actions.

If anyone is curious on how something like this would be implemented correctly I would recommend reading Russ Cox's series of posts, and convert a regular expression into a proper DFA as described here. Then this library reduces to traversing the DFA randomly until reaching an accept state.

This is a project built with marpa.

Given a regular expression, generate a string that matches that expression

Add this to your application's shard.yml:

dependencies:
  jager:
    github: omarroth/jager

require "jager"

regex = /\d{3}-\d{3}-\d{4}/
engine = Jager::Engine.new

input = engine.generate(regex)

input # => "754-327-6740"

• Jager does not support:
  • anchors ($, ^),
  • extended character classes ([[:digit:]], [[:alpha:]])

1. Fork it ( https://github.com/omarroth/jager/fork )
2. Create your feature branch (git checkout -b my-new-feature)
3. Commit your changes (git commit -am 'Add some feature')
4. Push to the branch (git push origin my-new-feature)
5. Create a new Pull Request

• omarroth Omar Roth - creator, maintainer