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Dirty Secrets of the Perl Regex Engine
Slides from a talk the author presented at TPC and YAPC. Covers the /o flag and re 'eval'.

How Regexes Work
An article about how to use regular expressions in Perl by M-J Dominus.

MakeRegex
The Perl-module by Hakan Kjellerstrand composes a regex-expression from a list of words.

Perl FAQ : Regular Expressions
Pattern matching and regular expressions.

Perl Regex
An introduction covering basic concepts.

Perl Regular Expression Matching is NP-Complete
A discussion of the complexity of regular expression matching algorithms in Perl.

Perl Regular Expression Quick Reference
One-page document containing tabulated summaries of common codes, modifiers, and special characters. [PDF]

Perl Regular Expression Tutorial
A tutorial that shows how to use Regular Expressions in Perl.

Perldoc.com - perlre
Describes the syntax of regular expressions in Perl.

Perldoc.com - perlretut
A tutorial for regular expressions in Perl.

perl.perl6.language.regex
Archive of discussion relating to regular expressions in Perl 6.

perlretut
Basic tutorial, distributed as part of the core documentation.

Regular Expressions
A description of the patterns used in Perl for pattern matching.

PERL5 Regular Expression Description
Detailed description written by Tom Christiansen in response to a question posted to comp.lang.perl.misc. (February 13, 1996)