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RegexPlanet

RegexPlanet

- Testing
- Patterns
- Status
- Support

# Online Regular Expression Testing

Regular expressions are an incredibly powerful tool, but can be rather tricky to get exactly right. This is a website that I wrote so I could quickly and easily test regular expressions during development.

Pick which programming language you are using:

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##### Sharing

Share codes are an easy way to share regexes. If you have a share code, enter it here:

Go

##### Status

A badly formed regular expression can run forever, making it very useful for denial of services attacks. Some of the engines/hosts are susceptible to these.

Engine Status

##### Regex Zone

The Regex Zone is the place to share regular expressions and find common regex patterns.

Visit the Regex Zone

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## One last thing

Some people, when confronted with a problem, think “I know, I’ll use regular expressions.” Now they have two problems.
-- Jamie Zawinski in comp.lang.emacs (or somewhere else).

I define UNIX as “30 definitions of regular expressions living under one roof”.
-- Donald Knuth in Digital Typography, ch. 33, p. 649 (1999) via re2.

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