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{{Header Nav|game=StrategyWiki:Guide}}
{{Header Nav|game=StrategyWiki:Guide}}
{{wikipedia|Regular expression}}
{{wikipedia|Regular expression}}
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Regular expressions, often referred to as a regex or regexp, plural regexes or regexps, are used to help find changes that need to be replaced and to replace them.
Regular expressions, often referred to as a regex or regexp, plural regexes or regexps, are used to help find changes that need to be replaced and to replace them.


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==Tools==
==Tools==
To use a regular expression you will have to have find a code base that can run it. The easiest tools to use are:
To use a regular expression you will have to have find a code base that can run it. The easiest tools to use are:
*Google Chrome extension: [https://chrome.google.com/webstore/detail/search-and-replace/bldchfkhmnkoimaciljpilanilmbnofo Search and Replace 1.2.2]
*Google Chrome extension: [https://chrome.google.com/webstore/detail/search-and-replace/bldchfkhmnkoimaciljpilanilmbnofo Search and Replace 1.2.2]
*TextPad (go to Search >> Replace, or press F8). Note: TextPad used to use Unix's implementation and syntax, but now uses Perl/JavaScript's.
*TextPad (go to Search >> Replace, or press F8)


==Syntax differences==
==Syntax differences==
Note that some tools code their regular expression syntax differently. Major differences occur between programming languages and shells; e.g. Unix vs. Perl/JavaScript implementations.
Note that some tools code their regular expression syntax differently. For example, TextPad makes uses of simplified expressions, such as [:alpha:] to match a-z and A-Z.


Example: a simple parameter definition search in Unix may look like (this matches all characters a-b and 0-9, minimum of 1 time and maximum of 25 times in a single match):
;Uses
<pre>
\(a-b,0-9)\{1,25\}\)
</pre>
 
In Perl/Javascript syntax it looks like:
<pre>
(a-b,0-9){1,25}
</pre>
 
For example, TextPad makes uses of simplified expressions, such as [:alpha:] to match a-z and A-Z.
 
==Example uses==
*Adding a hundred file names to a table. See [http://strategywiki.org/w/index.php?title=Animal_Crossing:_New_Leaf/List_of_Fossils&diff=prev&oldid=674718 this example].
*Adding a hundred file names to a table. See [http://strategywiki.org/w/index.php?title=Animal_Crossing:_New_Leaf/List_of_Fossils&diff=prev&oldid=674718 this example].
**Regex used (in old TextPad Unix syntax): <nowiki>"| || \([[:alpha:][:blank:]]\{10,20\}\) || \(.\{1,10\}\) Bells"</nowiki> (without quotes).
**Regex used (in TextPad): "| || \([[:alpha:][:blank:]]\{10,20\}\) || \(.\{1,10\}\) Bells" (without quotes).
*Simplifying all lines with five character or above Pokemon names, and their identification number, in {{t|PokePic}}.
**Regex used (in new Textpad Perl/JavaScript syntax; without quotes): <nowiki>"\|([[:alpha:]]{5,25}) = [[][[]File[:]Pokemon ([0-9]{3})\{\{\{1\}\}\}.png\{\{!\}\}\{\{\{2\|40px\}\}\}\{\{!\}\}\{\{\{3\|none\}\}\}\]\]"</nowiki>


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