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Perl by Example, Fourth Edition by Ellie Quigley

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Chapter 8. Regular Expressions—Pattern Matching

Regular Expressions—Pattern Matching

What Is a Regular Expression?

If you are familiar with UNIX utilities, such as vi, sed, grep, and awk, you have met face-to-face with the infamous regular expressions and metacharacters used in delimiting search patterns. Well, with Perl, they’re back!

What is a regular expression, anyway? A regular expression is really just a sequence, or pattern, of characters that is matched against a string of text when performing searches and replacements. A simple regular expression consists of a character or set of characters that matches itself. The regular expression is normally delimited by forward slashes. ...

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