Perl regular expressions are text strings formed in a particular syntax that is used in the Perl programming language for searching text patterns within text.

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CPAN
Collection of regex modules. Includes documentation and download.
Equinoxbase
Online application. Converts Perl 5 regexps for Perl 6.
How Regexes Work
Collection of Perl regex resources. Includes tutorial, slideshow, class summary, code modules, PDF e-book.
MakeRegex
Perl module that creates regular expressions from word lists. Includes tester, instructions and download.
Perl Regular Expression Quick Reference
One-page cheat sheet. Contains tables of syntax elements such as character classes, quantifiers and modifiers. [PDF]
Perl Regular Expressions
Tutorial. Covers matching, replacing and sample problems such as matching a file path's double dots.
Perl Regular Expressions by Example
Basic introduction to Perl regex. Includes examples and partial syntax reference.
Perl.org
Regex resources on the official Perl site. Includes manual pages, tutorials and FAQs.
Perlfect
Online regex tester. Displays matches in bold.
A Regex Introduction
Tutorial. Covers basic syntax, tricks and traps.
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