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Regular Expression Tutorial By Jan Goyvaerts. May you apply to Unix, Linux or Perl without any idea about regex? Basically, a regular expression is a pattern describing a certain amount of text. A "match" is the piece of text, or sequence of bytes or characters that pattern was found to correspond to by the regex processing software. Regular espressions allow programmers to execute text manipulation on variable length strings. In this tutorial, I will teach you all you need to know to be able to craft powerful time-saving regular expressions. I will start with the most basic concepts, so that you can follow this tutorial even if you know nothing at all about regular expressions yet. I will focus on the regex flavor used by Perl 5, for the simple reason that this regex flavor is the most popular one, and deservedly so. Many more recent regex engines are very similar, but not identical, to the one of Perl 5.
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