Difference between revisions of "regular expressions"
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| − | == | + | ==Navigation== |
| − | [[computing]]: [[software]]: [[programming]]: [[ | + | [[computing]]: [[software]]: [[programming]]: [[regular expressions]] |
==Overview== | ==Overview== | ||
| − | [[ | + | [[regular expressions|Regular expressions]] ("[[regex]]" for short) is a syntax used in string matching and replacement. It is especially heavily used in [[Perl]], and the [[Linux]] utility {{Linuxcmd|grep}} is basically a front end for regex geared towards file-searching. |
==Articles== | ==Articles== | ||
* [[Perl regex]] | * [[Perl regex]] | ||
Latest revision as of 13:36, 26 April 2011
computing: software: programming: regular expressions
Overview
Regular expressions ("regex" for short) is a syntax used in string matching and replacement. It is especially heavily used in Perl, and the Linux utility grep is basically a front end for regex geared towards file-searching.
Articles
Examples
- \[http://[a-z|0-9|\.|\-]+\.[a-z|0-9|.|\-]+[a-z|0-9|\.|\-\/]* [a-z|0-9| ]+\]( )*
- matches a link in MediaWiki markup (it could probably be more precise, but catches most of them)
- (\[http://[a-z|0-9|\.|\-]+\.[a-z|0-9|.|\-]+[a-z|0-9|\.|\-\/]* [a-z|0-9| ]+\]( )*){5,}
- matches at least 6 links in a row with nothing except spaces between them; good for detecting spam
Links
Reference
Posts
- 2008-04-01 Regex in a Nutshell: small collection of links including a how-to, two online testers, and a "cheat sheet" PDF
- 2006-02-19 Visualizing Regular Expressions: blog entry by the author of reAnimator, a regex implementation visualizer