MediaWiki extensions manual
Release status: unmaintained
Implementation Parser function
Description Allows for multiple patterns of text, either plain or RegExp based to be replaced using a parser function.
Author(s) Daniel Friesen (Dantmantalk)
Latest version 1.6.0 (2018-03-09)
MediaWiki 1.25+
PHP 5.4+
Database changes No
License GNU General Public License 2.0 or later
Example sandbox.semantic-mediawiki.org
  • $egReplaceSetPregLimit
  • $egReplaceSetCallLimit
Quarterly downloads 1 (Ranked 141st)
Translate the ReplaceSet extension if it is available at translatewiki.net

The ReplaceSet extension allows for patterns of text, either plain or RegExp based to be replaced. The idea is to allow many patterns to be replaced simply without overloading the Parser with dozens of ParserFunctions and allow for simple replace based syntaxes to be built such as linking certain words in a Card lore.

ReplaceSet is coded to make full use of PCRE's performance. All the replacement patterns are passed together at once to PCRE instead of looping over each one and doing replacements separate, this avoids shuffling between PCRE and PHP.


{{#replaceset: text to replace | regex pattern or string to be replaced = replacement | ... }}

Regex patterns are wrapped in !pattern! #pattern# (pattern) [pattern] or {pattern}, and may be followed with any of the flags "imsxADU" (see PHP documentation on PCRE Pattern Modifiers for what they individually do). Patterns that do not use any of those will be considered plaintext replacements such as "|A=B|" (replace all occurrences of "A" with "B").

If you need to use an = or an | within the pattern or text you want to replace you can wrap the pattern inside of a nowiki. ie: {{#replaceset:A=B|<nowiki>=</nowiki>=&}}

{{#replaceset:Text to replace|/(\w+)/i="\1"|to=2}}

Would produce "Text" "2" "replace".


  • Download and move the extracted ReplaceSet folder to your extensions/ directory.
    Developers and code contributors should install the extension from Git instead, using:cd extensions/
    git clone https://gerrit.wikimedia.org/r/mediawiki/extensions/ReplaceSet
  • Add the following code at the bottom of your LocalSettings.php file:
    wfLoadExtension( 'ReplaceSet' );
  • Configure as required.
  •   Done – Navigate to Special:Version on your wiki to verify that the extension is successfully installed.



Two configurable limitations are set for the {{#replaceset}} parser function:

A limit to the number of times #replaceset may be used in a page. This is set to 25 by default.
A limit passed to preg limiting the number of replacements within the text to replace that will be made. This is set to 50 by default.

See also