Excellent tools for creating regulat expressions ! Have an expresso 
Basic features resume :
Still free of charge!
Build complex regular expressions by selecting components from a palette
Test expressions against real or sample input data
Display all matches in a tree structure, showing captured groups, and all captures within a group
Build replacement strings and test the match and replace functionality
Highlight matched text in the input data
Test automatically for syntax errors
Generate Visual Basic or C# code
Save and restore data in a project file
Maintain and expand a library of frequently used regular expressions
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http://www.ultrapico.com/Expresso.htm
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