It appears that regex (as in regular expressions) is not supported in excel, except via VBA. Is this so, and if it is, are there any \"open source\" custom VBA functions tha
Here's a post regarding Regex usage in Excel:
http://mathfest.blogspot.com/2010/03/regular-expressions-in-excel.html
Hope it helps.
And another which uses Python and IronSpread
http://mathfest.blogspot.ca/2012/06/using-ironspread-and-regular.html