A regular expression describes a set of strings, according to certain syntax rules.
In this post, I just want to give beginners an idea. The topic 'Regular Expressions' is quite big. Unix commands - grep and sed were the first to popularize the concept. Many programming language support regular expressions for string manipulation. Perl has a powerful regex engine. The support/use of regular expressions gives Perl very powerful text-processing capabilities.
man perlre gives you access to a man page dedicated to regular expressions and their use in Perl. Beginners, mastering regular expressions is the key to excelling in Perl programming !
Enjoy regular expressions :-)
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