Difference between revisions of "regular expressions"
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m (moved regex to regular expressions: proper name) |
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Revision as of 13:34, 26 April 2011
computing: software: programming: regex
Overview
Regex is shorthand for "Regular Expressions", 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