Support for Regular Expressions is not included in the paid support options for Importacular.
For a good overview and tutorial
http://www.regular-expressions.info/
Importacular and Regular Expression Transformations | RE-Decoded
For applications that help you design regular expressions:
http://www.ultrapico.com/expresso.htm
http://www.regexbuddy.com/create.html
If you would like us to develop them for you, then we can do that too (at our usual rate).