If you're needing advanced search and replace capabilities in Microsoft Excel, this add-in is for you.  RegEx Find/Replace is a freeware add-in for Microsoft Excel which combines Excel's own find and replace features with the power of regular expressions.  It also includes regular expression worksheet functions you can use to extract, replace or compare data via cell formulas.  To read more about it, visit the RegEx Find/Replace main page, or skip to the download page to try it out.