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Online regex tester, debugger and replacement tool with real time explanation, error detection and highlighting for PHP, PCRE, Python and JavaScript. Come and check out the free educational regex quiz!

Rubular is a Ruby-based regular expression editor and tester. It

A visual regex helper

At Regular-Expressions.info you will find a wide range of in-depth information about a powerful search pattern language called regular expressions.

Online Silverlight regular expression tester with instantaneous highlighting, C# and VB.NET code generation, code completion, regex analysis, benchmarking, and more.

RegexBuddy is your perfect companion for working with regular expressions. Learning, creating, understanding, testing, using and saving regular expressions has never been easier.

Regex validation. Test PHP, Perl or Javascript regular expression - instant live AJAX online testing tool (regex validator). Search and replace with RegExp.

Regular Expression Library provides a searchable database of regular expressions. Users can add, edit, rate, and test regular expressions.

PyRegex is a online regular expression tester to check validity of regular expressions in the Python language regex subset.

Online tools for developers, including formatters (JSON, XML, HTML, SQL, etc.), minifiers (JavaScript, CSS), validators, compactors and many more!

RegexOne provides a set of interactive lessons and examples to help you learn regular expressions