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  • A regular expression (regex or regexp for short) is a special text string for describing a search pattern.
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  A regular expression (regex or regexp for short) is a special text string for describing a search pattern. You can think of regular expressions as wildcards on steroids. You are probably familiar with wildcard notations such as *.txt to find all text files in a file manager. The regex equivalent is .*\.txt$. But you can do much more with regular expressions. In a text editor like EditPad Pro or a specialized text processing tool like PowerGREP, you could use the regular expression \b[A-Z0-9._%+-]+@[A-Z0-9.-]+\.[A-Z]{2,4}\b to search for an email address. Any email address, to be exact. A very similar regular expression (replace the first \b with ^ and the last one with $) can be used by a programmer to check whether the user entered a properly formatted email address. In just one line of code, whether that code is written in Perl, PHP, Java, a .NET language, or a multitude of other languages.

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  Regex Tutorial, Examples and Reference.
  A regular expression (regex or regexp for short) is a special text string for describing a search pattern. You can think of regular expressions as wildcards on steroids. You are probably familiar with wildcard notations such as *.txt to find all text files in a file manager. The regex equivalent is ^.*\.txt$.

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Page Comments

• 
  Alberto Adrián Schiano on 2006-04-14
  If you just want to get your feet wet with regular expressions, take a look at the one-page regular expression quick start. While you can't learn to efficiently use regular expressions from this brief overview, it's enough to be able to throw together a bunch of simple regular expressions. Each section in the quick start links directly to detailed information in the tutorial.
• 
  Lindsay Donaghe on 2006-08-23
  Nice RegEx tutorial site with good examples of pattern matching and several links to tools, including a testing tool on the site.
• 
  Shannon Holman on 2006-12-03
  - Regex Tutorial, Examples and Reference - Regexp Patterns
• 
  Graham Perrin on 2009-11-18
  Referred from within the Exclude Files preference pane of ClamXav 2.0.4 (217).

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