Brilliant add on Rated 5 out of 5 stars

A brilliantly useful tool for testing regular expressions.

Some other reviews mention problems. Worked for me on Ubuntu 10 straight away.

You can turn off automatic brackets in the options, if you find them confusing; other settings also available.

Older versions also available to download if issues remain.
I find it an indispensable tool

This review is for a previous version of the add-on (3.0).