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

create-regex

v0.0.2

Published

JS regex helper, easy way to create complex regular expressio in js

Downloads

15

Readme

Create Regex

Greenkeeper badge NPM Version Build Status Test Coverage

Simple and powerful utility to create complex regex in javascript

Create regex

When creating long and powerful regular expression it becomes hard to remember and manage to numerous signs and sub patterns.

create-regex allows you to write regex in code like approche while also reducing the burden of some boilerplate actions. It also encourges the usage of regex named groups, which make the matching part of the regex much simpler.

Simple to use

  // import the regex factory
  const {RegExpFactory} = require('create-regex');
  // The regex factory assit you in creating the regex instance
  const regexFactory = new RegExpFactory({ });
  // Now by using the `create` method you create the regex instance
  // For more advanced usage go to the `API` section
  const yourRegex = regexFactory.create(({
    nonCaptureGroupWithSeperator,
    group
  })=>
    nonCaptureGroupWithSeperator([
      group('digits','\\d+'),
      group('words', '\\w+'),
      group('else', '[\\s\\S]+')
    ])
  ,'gm');
  /*
    Prodcues the following regex:
    /(?:(?:(?<digits>\d+))|(?:(?<words>\w+))|(?:(?<else>[\s\S]+)))/gm
    Try it with the following string (we higly recommend to using the site `regex101`)
  */
  const str = '121212ababa...{}';
  let match;

  while ((match = regex.exec(str)) !== null) {
      // This is necessary to avoid infinite loops with zero-width matches
      if (match.index === regex.lastIndex) {
          regex.lastIndex++;
      }
      
      Object.keys(match.groups).forEach((groupName) => {
      if (match.groups[groupName])
          console.log(`Found match, group ${groupName}: ${match.groups[groupName]}`);
      });
  }
  //It should produce the following output
  /*
    Found match, group digits: 121212
    Found match, group words: ababa
    Found match, group else: ...{}
  */

API

The API is very simple and yet powerfull. The factory accepts mixins that you will be able use during create

  const regexFactory = new RegExpFactory({ 
    mixins: {
      stringSigns: [`'`,'"',"'"]
    },
    RegExp : RegExp // <-- you can overide the regex used internally
  });
  // Let's say we want to match quoted number and digits
  // Really quoted with the same string sign from both sides
  regexFactory.create(({
      // Built in helpers
      nonCaptureGroupWithSeperator,
      group,
      wrapPattern,
      // User mixins
      stringSigns
    })=>
      nonCaptureGroupWithSeperator([
        group('digits',
          wrapPattern('\\d+',stringSigns)
        ),
        group('words',
          wrapPattern('\\w+',stringSigns)
        ),
        group('else', '[\\s\\S]+')
      ])
    ,'gm');
  /* Produces the following regex:
    /(?:(?:(?<digits>(?:(?:'\d+')|(?:"\d+")|(?:'\d+'))))|(?:(?<words>(?:(?:'\w+')|(?:"\w+")|(?:'\w+'))))|(?:(?<else>[\s\S]+)))/gm
  */

License

MIT