Books
“Mastering Regular Expressions” O’Reilly, 2006. Jeffrey Friedl
“Regular Expressions Cookbook” O’Reilly, 2009, 2012. Jan Goyvaerts, Steven Levithan
Cheat Sheets
http://www.cheatography.com/davechild/cheat-sheets/regular-expressions/
http://opencompany.org/download/regex-cheatsheet.pdf
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Online References
http://www.regular-expressions.info/
http://msdn.microsoft.com/en-us/library/az24scfc.aspx
How Do You Debug a Regular Expression?
http://stackoverflow.com/questions/2348694/how-do-you-debug-a-regex
Catastrophic Backtracking
http://www.regular-expressions.info/catastrophic.html
RegEx Buddy Demos
http://www.regexbuddy.com/democreate.html
http://www.regexbuddy.com/demotest.html
http://www.regexbuddy.com/demojava.html