Extreg
- http://www.ososo.de/extreg/
- A script that allows to perform search-and-replace operations with extended regular expressions from unix shells.
RegExplorer
- http://regexplorer.sourceforge.net/
- A visual regular expression explorer, it allows for writing regular expressions and visually see the matches. Uses the KDE/Qt Libraries for the user interface. [QPL]
Regular Expressions explained
- http://zez.org/article/articleview/11/
- An article by Jan Borsodi that gives an introduction to the world of regular expressions. It explains what regular expressions are and introduces the syntax. Also provides examples with varying complexity and a list of tools which use regular expressions.
The Regex Coach
- http://weitz.de/regex-coach/
- Graphical application for Linux and Windows which can be used to experiment with (Perl-compatible) regular expressions interactively.