jager

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

Installation

Add this to your application's shard.yml:

dependencies:
  jager:
    github: omarroth/jager

Usage

require "jager"

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

input = engine.generate(regex)

input # => "754-327-6740"

Examples

Name	Regex	Output
US Phone	/\d{3}-\d{3}-\d{4}/	"019-586-1821"
UUID	/[a-f0-9]{8}-[a-f0-9]{4}-[a-f0-9]{4}-[a-f0-9]{4}-[a-f0-9]{12}/	"0d007d29-f50b-4763-f40e-102fcaa77a1b"
JSON Number	/-?[1-9]\d+(.\d+)?([eE][+-]?\d+)?/	"85.2292e+6745508109"
US Dollar	/\$([1-9]{1}[0-9]{0,2})(,\d{3}){0,4}(.\d{2})?/	"$7,239,557,686.39"

Notes

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

Contributing

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

Contributors

• omarroth Omar Roth - creator, maintainer