Regular expressions - An introduction

http://www.aivosto.com/vbtips/regex.html

http://regexlib.com/

http://www.regular-expressions.info/examples.html

http://www.regular-expressions.info/reference.html

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

http://wiki.tcl.tk/989

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

http://net.tutsplus.com/tutorials/other/8-regular-expressions-you-should-know/

http://msdn.microsoft.com/en-us/library/kweb790z.aspx