RegEx Lab allows you to test regular expressions. The app highlights and underlines text to show matches and capture groups. There's also a handy cheatsheet and a results list view. It has a replace feature too.


RegEx Lab allows you to test regular expressions. The app highlights and underlines text to show matches and capture groups. There's also a handy cheatsheet and a results list view. It has a replace feature too.


The PCRE library is a set of functions that implement regular expression pattern matching using the same syntax and semantics as Perl 5. PCRE has its own native API as well as a set of wrapper functions that correspond to the POSIX regular expression API.
Online API Mocking Tool: API Mock, fake API, stub API, simulate API, dummy API. Capture and debug requests instantly. Forward requests to localhost for webhooks testing and debugging. More than 100 random or faker shortcodes for response templating.



Regexp testing tool allows to apply group of regexps to huge arrays of data (millions or so) in order to investigate search or search/replacement possibilities of regexp group.

Easily test your regular expressions against a sample body of text in a native UWP app designed for Windows 10. Just type your regex and it instantly begins matching as you type. Any capture groups are automatically highlighted, and the app works completely offline.


A DFA based Regex engine that supports submatches. Built with Nim (programming language). Benchmarks show nregex is up to 7 times faster than Perl Compatible Regular Expressions.

Pythex is a real-time regular expression editor for Python, a quick way to test your regular expressions.

FormulaBuddy makes your life easier by quickly generating Excel formulas, Database queries, Cron, and Regular Expressions with the help of AI. You just need to write your query in words and it will generate the formula for you.



Regex 2.4.2 is a focused regular expression editor and tester for macOS 14.2 or later. It uses the Swift Regex engine and shows explicit empty, invalid, zero-match, and matching states while highlighting matches and counts live.




Zoekt is a text search engine intended for use with source code. (Pronunciation: roughly as you would pronounce "zooked" in English).
TRE is a lightweight, robust, and efficient POSIX compliant regexp matching library with some exciting features such as approximate (fuzzy) matching.
Oniguruma is a modern and flexible regular expressions library. It encompasses features from different regular expression implementations that traditionally exist in different languages.
RegexTutorials helps you learn regular expressions through a series of courses and excercises.

RegEx Helper is a free tool for generating RegEx patterns using natural language. It explains the pattern, which improves understanding.



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 with wrappers for many languages including Perl, Python, Erlang and more.