He focuses on the many different possiblities in PERL for matching specific characters. Last column we learned various ways to work with files. This column deals with extracting information with regular expressions. There's much to know about regular expressions, and this article is more a checklist of regular expression components than an in-depth analysis of their features. Know your Regular Expressions Perl's regular expressions are optimized for lines.
Square brackets define the acceptable possibilities for matching a single character.
It is important also to know the negated shortcut classes. You can change the delimiters to any character you want without having to mark the regexp with slashes. 2000 ZD Inc. All rights reserved.