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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!

A visual regex helper

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

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

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

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

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

Myregextester.com is an online regular expressions tester that allows visitors to construct, test, and optimize regular expressions.

Best practices, URL-rewriting and Java URL Rewrite Filter tools, test-driven development, agile software methodology, component based design. We make software you can love.

Online tool for building and testing .NET regular expressions. Features a .NET regex tester and complete .NET regex reference.