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  • Regular expressions trace back to the work of an American mathematician by  the name of Stephen Kleene (one of the most influential figures in the  development of theoretical computer science) who developed regular expressions  as a notation for describing what he called "the algebra of regular sets." His  work eventually found its way into some early efforts with computational search  algorithms, and from there to some of the earliest text-manipulation tools on  the Unix platform (including ed and grep). In  the context of computer searches, the "*" is formally known as a "Kleene  star."
  • As you might guess from this example, concision is everything when it comes to crafting regular expressions, and while this syntax won't win any beauty prizes, it follows a logical and fairly standardized format which you can learn to read and write easily with just a little bit of practice.

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Page Comments

• 
  Richard on 2006-08-07
  Using Regular Expressions

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