Wiki hilsz.com: Regex

http://www.codeproject.com/Articles/9099/The-30-Minute-Regex-Tutorial

http://www.hongkiat.com/blog/regular-expression-tools-resources/#post-9477

http://en.wikipedia.org/wiki/Regular_expression

http://www.codeproject.com/Articles/939/An-Introduction-to-Regular-Expressions

http://www.zytrax.com/tech/web/regex.htm