A look at using Regular Expressions (RegEx)

Visualizing, testing, and understanding complex regex patterns has never been easier.

Debuggex is a regex visualizer and debugger plus Javascript engine and more. This realtime tool makes everything as visual as possible, ...

This tool rocks. It displays a visual flow of how the current regex is matching, shows you which part of your test string is currently matching and a really ...

Important caveat: it makes use of a hidden Java applet -- so that it can supports the somewhat larger Java regex syntax, doesn't send your data ...

You buy RegexBuddy and use its built in debug feature. If you work with regexes more than twice a year, you will make this money back in ...

The website appears to be faulty. An un-anchored Regular Expression pattern of aaaa will match on the string fhaaaaaaachoeore .

Test your regex by visualizing it with a live editor. JavaScript, Python, and PCRE.

Regular Expression Flags. i, Ignore case. m, ^ and $ match start and end of line. s . matches newline as well. x, Allow spaces and comments.

Just released: You can now add unit tests for your regular expressions on Debuggex. Export directly to your environment will be coming soon.