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	Unicode Regular Expression Guidelines - http://www.unicode.org/unicode/reports/tr18/ Unicode Technical Report #18: This document describes guidelines for how to adapt regular expression engines to use Unicode.
	MSDN .NET Regular expressions - http://msdn.microsoft.com/library/default.asp?url=/library/en-us/cpgenref/html/cpconRegularExpressionsLanguageElements.asp MSDN documentation on .NET regular expressions.
	Regular Expressions Tutorial - http://www.regular-expressions.info/ 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 Expression HOWTO - http://www.amk.ca/python/howto/regex/regex.html Detailed HowTo documentation about regular expressions usage in combination with the Phyton programming/scripting language.
	grep - Regular Expressions - http://www.gnu.org/software/grep/doc/grep_7.html Documentation of the Regular Expression syntax used in GNU grep.

	Regular Expressions - Single Unix Specification - http://www.opengroup.org/onlinepubs/007908799/xbd/re.html Specification for regular expressions -- massive document, somewhat technical.
	Regular Expressions in ne (Nice Editor) - http://www.emerson.emory.edu/services/editors/ne/Regular_Expressions.html A description of the regular expression support in ne (Nice Editor).
	Mastering Regular Expressions (Second Edition) - http://regex.info/ Book by Jeffrey Friedl. Includes table of contents, full index, an errata sheet.
	Programming in Emacs Lisp - Regular Expression Searches - http://www.gnu.org/software/emacs/emacs-lisp-intro/html_node/Regexp-Search.html Documentation of the Regular Expression syntax used in Emacs Lisp.
	GNU awk User's Guide - Regular Expressions - http://www.gnu.org/software/gawk/manual/html_node/Regexp.html Documentation of the Regular Expression syntax used in GNU Awk.

	Regular Expressions: An Introduction - http://www.digitalamit.com/article/regular_expression.phtml An essential guide to one of the most useful tools in the web development: regular expressions.
	Using Regular Expressions - http://www.landings.com/_landings/pages/regex.html Good overview of regular expression operators, although some features described might not be available in your implementation.
	Regular Expression Quick Reference - http://www.night-ray.com/regex.pdf Single sheet quick reference card for regular expressions.
	Regex on Pete Freitag's Blog - http://www.petefreitag.com/tag/regex The basics of using regular expressions with ColdFusion's REFind, and REReplace functions.
	Seeing With C - Regular Expressions - http://www.seeingwithc.org/topic7html.html A writeup on regular expressions connecting the math. and the CS views to regular expressions.

	Regular Expressions - http://www.ipgp.jussieu.fr/~choi/LGM/UNIX/regex.html A brief and general introduction.
	RE Tool - http://www.indiwiz.com/products/retool/index.php Java based cross platform tool to learn Regular Expressions by "Trial and Error". Comes with Regular Expressions reference.
	Posix Basic Regular Expression - http://chaos4.phy.ohiou.edu/~thomas/ref/info/rx/Top.html 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.
	Regular Expressions Tutorial at Zvon - http://www.zvon.org/other/PerlTutorial/Books/Book1/ A tutorial with many examples which can be downloaded for off-line use.
	Regular Expressions Reference - http://www.zvon.org/other/reReference/Output/ Downloadable reference with examples, by Miloslav Nic.

Regular expressions - http://www.seas.upenn.edu/~cit596/notes/dave/regexp0.html
An introduction from a University course.

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