npm package discovery and stats viewer.

Discover Tips

  • General search

    [free text search, go nuts!]

  • Package details

    pkg:[package-name]

  • User packages

    @[username]

Sponsor

Optimize Toolset

I’ve always been into building performant and accessible sites, but lately I’ve been taking it extremely seriously. So much so that I’ve been building a tool to help me optimize and monitor the sites that I build to make sure that I’m making an attempt to offer the best experience to those who visit them. If you’re into performant, accessible and SEO friendly sites, you might like it too! You can check it out at Optimize Toolset.

About

Hi, 👋, I’m Ryan Hefner  and I built this site for me, and you! The goal of this site was to provide an easy way for me to check the stats on my npm packages, both for prioritizing issues and updates, and to give me a little kick in the pants to keep up on stuff.

As I was building it, I realized that I was actually using the tool to build the tool, and figured I might as well put this out there and hopefully others will find it to be a fast and useful way to search and browse npm packages as I have.

If you’re interested in other things I’m working on, follow me on Twitter or check out the open source projects I’ve been publishing on GitHub.

I am also working on a Twitter bot for this site to tweet the most popular, newest, random packages from npm. Please follow that account now and it will start sending out packages soon–ish.

Open Software & Tools

This site wouldn’t be possible without the immense generosity and tireless efforts from the people who make contributions to the world and share their work via open source initiatives. Thank you 🙏

© 2024 – Pkg Stats / Ryan Hefner

exreg

v1.2.0

Published

A "reverse" regular expression module. Takes a regular expression and returns a string guaranteed to match it.

Downloads

5

Readme

exreg

npm package

Build Status Code Climate Test Coverage

A module to generate strings to match regular expressions

Creating Strings for regular expressions

While it's easy to create a regular expression to match a string, doing the opposite can be quite challenging.

This module will take a regular expression and generate a string that is guaranteed to be matched by that regular expression. In version 1.x.x, a regular expression will always result in the same string and it will be the simplest string that will match it. \d will always result in a 0; \b will always result in an a. In version 2.x.x, I'll add support for more varied matching strings.

What regex features are supported?

The latest support can be found by running npm test in this project. The specs will be listed as the tests pass.

However, for convenience, I'll list what's currently supported here:

  • The . character
  • Normal characters
  • The | character
  • Standard character classes
  • Inclusive character classes of the form [...]
  • Quantifiers
  • Groups (capturing and non-capturing)
  • Special characters

Not currently supported:

  • Lookaheads
  • Captured Group references
  • Word boundaries
  • Start/end of string matchers
  • Exclusive character classes of the form [^...]

Bug reporting

If you find a regex such that the generated string is not a match please open an issue and include the failing regex.

Contributing

Any code that you'd like to contribute (and I'd be very appreciative of it) should be submitted via a Pull Request. There should be tests to support your change and they should pass.

Releasing a new version

Do the following:

  • Make sure you're on develop and that you're in sync with the git repo
  • npm version
  • git push
  • Create a PR into the master branch of exreg
  • Once this PR is approved and merged, the new version will be published