- Chromium Blog: Irregexp, Google Chrome's New Regexp Implementation
- re-try
- Test a Python regular expression on text and get results.
- Mac App Store - iRegEx
- 37 Tested PHP, Perl, and JavaScript Regular Expressions
- Using Regular Expressions in Visual Studio
- Best online regex testers Regular expression testers online free
- On Structural Regexes – lubutu
- UTS #18: Unicode Regular Expressions
- Regular Expressions - a Simple User Guide and Tutorial
- slevithan/XRegExp
- My Eureka Moment With Regular Expressions - Glenn Stovall
- Search for "category:regex" - Gitorious
- Regular expressions in R
- Interpreted Languages: PHP, Perl, Python, Ruby (Sheet One) - Hyperpolyglot
- Coding Horror: Regular Expressions: Now You Have Two Problems
- Jeffrey Friedl's Blog » Source of the famous “Now you have two problems” quote
- Regex Tester – RegexPal
- Dynamic Regex Highlighting with Javascript! (Rev:20100921_2200)
- jmrware/DynamicRegexHighlighter - GitHub
- InterMapper Forums :: View topic - A Regular Expression for IPv6 Addresses
- kiki-re - Free environment for regular expression testing - Google Project Hosting
- Regular Expression Matching in the Wild
- re2 - an efficient, principled regular expression library - Google Project Hosting
- Sculpting text with regex, grep, sed and awk
- How to Match IPv4 Addresses with Regular Expressions - O'Reilly Answers
- regex 0.1.20120209 : Python Package Index
- Regular Expressions Cheat Sheet by DaveChild - Cheatography.com
- Regex vs IndexOf in Java. | Vanilla #Java
- src/com/twitter/Regex.java
- Regexes for twitter
- Approximate Regex Matching in Python | Hacker Boss
- Dorophone: Shadchen: A pattern Matching Library for Elisp
- Python re.DEBUG flag
- fent/randexp.js - GitHub
- Generate sample text from a regular expression
- Regular expressions - HaskellWiki
- Library dart:core / Interface RegExp
- Erlang Programming Language: EEP 11 - Regular Expressions
- Regular Expression HOWTO — Python v2.7.2 documentation
- Regular Expression Poetry & Poetics
- RegexKit | Free Development software downloads at SourceForge.net
- An Objective-C Framework for Regular Expressions using the PCRE Library for Mac OS X
- C# Regular Expression Recipes at C# Online.NET
- RegEx Online
- [Chapter 6] Pattern Matching
- Learn Code The Hard Way -- Books And Courses To Learn To Code
- txt2re: headache relief for programmers
- regular expression generator
- XRegExp: JavaScript regex library
- RegexMagic
- tries to generate a regex given a set of inputs. MS Windows.
- parseUri 1.2: Split URLs in JavaScript
- Newest 'regex' Questions - Stack Overflow
- Regular Expression Language - Quick Reference
- Microsoft dotNet regex syntax
Also see links to other regex testing websites/programs on the Similiar Tools page.

