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:

Your Browser Bun Deno Go Java .NET Node.js Perl PHP PostgreSQL Python Ruby Rust Swift tcl XRegExp

Sharing

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

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

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.