Word wildcards are at this URL:

http://office.microsoft.com/en-us/wo...005189433.aspx

Don't forget to click the More button and check 'use wildcards' .

Below is the string I use to find acronyms. It also finds acronyms that include digits-- the problem being that it also stops on plain old numbers. See if it does you any good.

[ETAOINSRHDLUCMFYWGPBVKXQJZ1234567890_-]{2,}