Difference between revisions of "Help:Regular expressions"

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m (SuperHamster moved page Nookipedia:Regular expressions to Help:Regular expressions: Moving to help namespace)
(→‎Examples: Removing deprecated HTML example, since it's subject to errors if multiple tags are on one line)
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* [https://regex101.com/ regex101.com]
 
* [https://regex101.com/ regex101.com]
 
* [https://regexr.com/ regexr.com]
 
* [https://regexr.com/ regexr.com]
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* [https://extendsclass.com/regex-tester.html extendsclass.com]
  
 
== Examples ==
 
== Examples ==
 
Below is a list of examples of regular expressions that may help you on the wiki. Feel free to expand this list.
 
Below is a list of examples of regular expressions that may help you on the wiki. Feel free to expand this list.
 +
 +
* Replacing instances of <code><nowiki>{{I|Item Name}}</nowiki></code> with <code><nowiki>{{I|Item Name|New Horizons}}</nowiki></code> (Python):
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:Find: <code><nowiki>{{I\|(?!.*\|)(.*?)}}</nowiki></code>
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:Replace: <code><nowiki>{{I|\1|New Horizons}}</nowiki></code>
  
 
* Matching a multi-line Foreignname template and adding a new "See also" section after it (Python):
 
* Matching a multi-line Foreignname template and adding a new "See also" section after it (Python):
 
:Find: <code><nowiki>{{Foreignname([\s\S]*?\n}})</nowiki></code>
 
:Find: <code><nowiki>{{Foreignname([\s\S]*?\n}})</nowiki></code>
:Replace: <code><nowiki>{Foreignname\1\n\n==See also==</nowiki></code>
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:Replace: <code><nowiki>{{Foreignname\1\n\n==See also==</nowiki></code>
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* Add <code>f#-img</code> parameters after each <code>furn#</code> parameter in instances of house templates; the template takes in the furniture name as a parameter and returns a filename (AWB):
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:Find: <code><nowiki>\|furn([1-9]\d?)= (.*)</nowiki></code>
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:Replace: <code><nowiki>|furn$1= $2\n|f$1-img= {{subst:Example|$2}}</nowiki></code>
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* Prepend an <code>html</code> selector to every CSS property in a stylesheet ([https://stackoverflow.com/a/37695196 source] on StackOverflow by [https://stackoverflow.com/users/6438812/ryan-worth Ryan Worth]):
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:Find: <code><nowiki>(^(?:\s|[^@{])*?|[},]\s*)(\/\/.*\s+|.*\/\*[^*]*\*\/\s*|@media.*{\s*|@font-face.*{\s*)*([.#]?-?[_a-zA-Z]+[_a-zA-Z0-9-]*)(?=[^}]*{)</nowiki></code>
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:Replace: <code><nowiki>$1$2html $3</nowiki></code>
  
[[Category:Nookipedia]]
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{{Nookipedia}}

Revision as of 03:58, July 7, 2021

A regular expression (regex) is a sequence of characters defining a search pattern. On the wiki, they are commonly used for finding and replacing text through Special:ReplaceText (staff only), AutoWikiBrowser, Pywikibot, or Scribunto/Lua modules.

Each tool/programming language uses its own ruleset for regular expressions:

If you need help with regular expressions, you may post on the talk page, or join the Nookipedia Discord and ask in the #wiki-tech channel.

Testing

There are several online tools to test our patterns. A small selection is listed below.

Examples

Below is a list of examples of regular expressions that may help you on the wiki. Feel free to expand this list.

  • Replacing instances of {{I|Item Name}} with {{I|Item Name|New Horizons}} (Python):
Find: {{I\|(?!.*\|)(.*?)}}
Replace: {{I|\1|New Horizons}}
  • Matching a multi-line Foreignname template and adding a new "See also" section after it (Python):
Find: {{Foreignname([\s\S]*?\n}})
Replace: {{Foreignname\1\n\n==See also==
  • Add f#-img parameters after each furn# parameter in instances of house templates; the template takes in the furniture name as a parameter and returns a filename (AWB):
Find: \|furn([1-9]\d?)= (.*)
Replace: |furn$1= $2\n|f$1-img= {{subst:Example|$2}}
  • Prepend an html selector to every CSS property in a stylesheet (source on StackOverflow by Ryan Worth):
Find: (^(?:\s|[^@{])*?|[},]\s*)(\/\/.*\s+|.*\/\*[^*]*\*\/\s*|@media.*{\s*|@font-face.*{\s*)*([.#]?-?[_a-zA-Z]+[_a-zA-Z0-9-]*)(?=[^}]*{)
Replace: $1$2html $3