If you’ve used Perl, you’ve probably used regular expressions (REs). We’ll give a quick intro to those who are new to Perl and REs, and we’ll show several ways to debug them. We’ll also talk about some advanced RE topics such as “negative look-behind assertions” and using REs outside of Perl.
Regular Expressions are a powerful and concise part of Perl and are one of the big reasons why Perl is so popular. We’ll start out giving a basic introduction to REs so we’ll all be on the same page. We’ll go over several techniques to debug them. We’ll go over common mistakes/traps. We’ll tackle some advanced RE topics like positive/negative look-ahead/behind assertions. Last we’ll look at using REs outside of perl in command-line tools like grep. This subject has lots of interesting detail, so we’ll have to move quickly to cover it all!
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