See also:

• Computers: Programming: FAQs, Help, and Tutorials  (35)

• GNU awk User's Guide - Regular Expressions - Documentation of the Regular Expression syntax used in GNU Awk.
• grep - Regular Expressions - Documentation of the Regular Expression syntax used in GNU grep.
• Mastering Regular Expressions (Second Edition) - Book by Jeffrey Friedl. Includes table of contents, full index, an errata sheet.
• Posix Basic Regular Expression - A description of both basic Posix Regular Expression syntax, the programming interface and some advanced features that are provided in the implementation of POSIX.2 regular expressions in the GNU C Library.
• Programming in Emacs Lisp - Regular Expression Searches - Documentation of the Regular Expression syntax used in Emacs Lisp.
• RE Tool - Java based cross platform tool to learn Regular Expressions by "Trial and Error". Comes with Regular Expressions reference.
• Regex on Pete Freitag's Blog - The basics of using regular expressions with ColdFusion's REFind, and REReplace functions.
• Regular Expression HOWTO - Detailed HowTo documentation about regular expressions usage in combination with the Phyton programming/scripting language.
• Regular Expression Quick Reference - Single sheet quick reference card for regular expressions. [PDF]
• Regular Expressions - A brief and general introduction.
• Regular expressions - An introduction from a University course.
• Regular Expressions - Single Unix Specification - Specification for regular expressions -- massive document, somewhat technical.
• Regular Expressions: An Introduction - An essential guide to one of the most useful tools in the web development: regular expressions.
• Regular Expressions in ne (Nice Editor) - A description of the regular expression support in ne (Nice Editor).
• Regular Expressions Reference - Downloadable reference with examples, by Miloslav Nic.
• Regular Expressions Tutorial - A tutorial and reference for many popular regular expression flavors used by programming languages like Perl, PHP, Java, C# and VB.NET as well as a description of general tools like PowerGREP and EditPad.
• Regular Expressions Tutorial at Zvon - A tutorial with many examples which can be downloaded for off-line use.
• Seeing With C - Regular Expressions - A writeup on regular expressions connecting the math. and the CS views to regular expressions.
• Unicode Regular Expression Guidelines - Unicode Technical Report #18: This document describes guidelines for how to adapt regular expression engines to use Unicode.
• Using Regular Expressions - Good overview of regular expression operators, although some features described might not be available in your implementation.