From Jimbojw.com

The RegexParserFunctions Extension is a MediaWiki extension that adds a parser function for performing regular expression replacements on text.

It is released under The MIT License.

Compatibility

This extension requires:

• MediaWiki 1.6.x, 1.9.x, 1.10.x or higher
• PHP 4.x, 5.x or higer

Installation

1. Download RegexParserFunctions, and be sure to rename the downloaded file to RegexParserFunctions.php.
2. Drop the downloaded script in $IP/extensions

   Note: $IP is your MediaWiki install dir.

3. Enable the extension by adding this line to your LocalSettings.php:

   require_once('extensions/RegexParserFunctions.php');

Usage

Once installed, editors of your wiki can evaluate regular expressions in one of two ways: simple match, and replacement.

Match

In match mode, #regex expects two arguments: a subject and a pattern. The output of the function is either the exact text of the match, or nothing if no match could be made.

For example, this:

{{#regex:abcdefg|/c.*f/}}

Would return this:

cdef

Replacement

In replacement mode, #regex expects three arguments: a subject, a pattern to match and a replacement expression. The output of the function is the result of replacing all matching strings with the replacement expression.

For example, this:

{{#regex:abcdefg|/c.*f/|X}}

Would return this:

abXg

Or, say you're trying to grab the last portion of a Title which is using a '/' to delimit subpages. For that, you could use:

{{#regex:{{PAGENAME}}|%^.*/(.*)$%|$1}}

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