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<form action="/share/index.html" class="form-inline" method="post">
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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:



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

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.
Check the current engine status to see if they are running.
Engine Status

The original version was Java-based and did not require a JavaScript-enabled
browser. No need to use it if the Java one above works for you, but a lot of
links go directly to it:
Previous version



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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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