For those starting out with Regex'es or those who are old hands here are some resources to help.

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1. .NET Framework Developer's Guide .NET Framework Regular Expressions
   
   • Regular Expression Language Elements
   • Character Classes such as. \d \s [ ]defined.
   • Quantifiers such as+ * ? { }
   • Options such asMultiline Compiled SingleLine
   • Expression Classes such as Regex Match MatchCollection GroupCollection
   • Regular Expression Examples
2. Tutorials
   • 30 Minute Regex Tutorial on CodeProject.
   • .Net Coders Regex Overview breaks down groups and matches in one of the best overviews of the topics.
   • Introduction to Regular Expressions on CodeProject.
   • Understanding Basic Regular Expression Syntax (Section 3.10.) in the CodeProject's book chapter previewMicrosoft Visual C# .NET 2003 Developer's Cookbook. Its a preview of Chapter 3: Strings and Regular Expressions.
   • Eric Gunnerson's Regex 101. A listing of differing match topics. Great for a beginner to look at after acquiring the basics of Regex, many examples.
   • How to: Search Strings Using Regular Expressions (C# Programming Guide) in MSDN Library.
3. Topics
   • General
     • Regular Expressions and the If Conditional on OmegaCoder's blog.
     • Want faster regular expressions? Maybe you should think about that IgnoreCase option...
     • (Compilation) For an overview of the three different modes,interpreted, on-the-fly compiled and precompiledsee the MSDN article CLR Inside Out, "Base Class Library Performance Tips and Tricks"
     • (Compilation To an Assembly) section 3.13. Building a Regular Expression Library in the CodeProject's book chapter previewMicrosoft Visual C# .NET 2003 Developer's Cookbook. Its a preview of Chapter 3: Strings and Regular Expressions.
     • Regex Hangs My Expression by David Gutierrez in the BCL team blog.
     • The RegexOptions.Compiled Flag and Slow Performance on 64-Bit .NET Framework 2.0 BCL Team Blog
     • How to use RegexOptions IgnorePatternWhitspace from the Base Class Library (BCL) Team Blog.
   • Balanced Groups
     • Regex and Balanced Matching by Ryan Byington (MSFT)
     • A look into Matching Balanced Constructs with .NET Regular Expressions by Wes Haggard.
     • Fun With .NET Regex Balancing Groups
4. Programs (Not Sponsored or Endorsed by Microsoft) Just listed; no order implied.
   
   • Expresso (.Net 2)(Free but registration) Used by most regex'ers; tool updated in 2007 to version 3.
   • Regular Expression Designer (.Net 1)
   • RegEx Buddy ($)
   • Regular Expression WorkBench (.Net 1.1)(Free)
   • Regular Expression Visualizer for VS2005 by Roy Osherove. Write up about it here at Visual Studio Hacks. Its a VS2005 add-in.
   • Regulator also by Osherove, which is a stand alone regex tester.
5. Web Based Regex Testers
   • NRegex Tester
   • .Net Coders Expression Tester
   • Regex Testor by RegExLib.com main site has library of regex'es for browsing.
   • Regular Expression Tester
6. Other Non Regex Tools
   • GPLEX Lexical Analyzer for when Regex comes up short and a forum post that gives an example of its usage.
7. Forums
   • RegexAdvice.com is where the core regexer's, many different languages not just .net, give advice. Let them know you are using the .Net version.
   • Google Groups Regex Discussing Regular Expressions in variuos tools (perl, php, egrep, PowerGREP, .NET, procmail etc. etc). Let's help each other build effective regexes!
   • ASP Message Board : Regular expressions general discussions.
8. Books
   • Regular Expressions with .NET (ebook) by Dan Appleman.
   • Mastering Regular Expressions, Third Edition by Jeffrey Friedl.
   • Sams Teach Yourself Regular Expressions in 10 Minutes by Ben Forta.
   • Regular Expression Recipes: A Problem-Solution Approach (ebook) by Nathan Good.
9. Blogs
   • Flagrant Badassery A JavaScript and regular expression centric blog
   • OmegaMan's Musings Regex Section

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