irregex

• regexp-examples

  2 520 0.0 Ruby

  Generate strings that match a given regular expression

I wrote this library to generate strings that match an arbitrary regex several years ago, purely for the fun/challenge of figuring it all out from scratch.

• RegExr

  579 9,548 0.0 JavaScript

  RegExr is a HTML/JS based tool for creating, testing, and learning about Regular Expressions.

this is actually a very good tool for beginners. I personally started to learn regex from https://regexr.com, but switched to regex101 eventually for regular use

• SurveyJS

  surveyjs.io featured

  Open-Source JSON Form Builder to Create Dynamic Forms Right in Your App. With SurveyJS form UI libraries, you can build and style forms in a fully-integrated drag & drop form builder, render them in your JS app, and store form submission data in any backend, inc. PHP, ASP.NET Core, and Node.js.

  

• RE2

  49 8,628 8.9 C++

  RE2 is a fast, safe, thread-friendly alternative to backtracking regular expression engines like those used in PCRE, Perl, and Python. It is a C++ library.

  

Regular expressions can (and any good library will) be compiled to a DFA that executes in linear time. As soon as you add forward or back references that becomes impossible and the exponential algorithm has to be used. This is why high performance regex engines like re2 don't support these features.

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