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,}

You should be able to achieve the same with:
[A-Z0-9_-]{2,}
or, if your acronyms always start with a letter:
[A-Z][A-Z0-9_-]{1,}
As for the numbers issue, if you mean it doesn't find complete numbers with thousands separators & decimal points, that's because neither of those is provided for in your Find expression. Problem is, though, that if you do so, it'll also pick up commas and periods.

__________________
Cheers,
Paul Edstein
[Fmr MS MVP - Word]

Thanks. I got in the habit of putting the letters in order of frequency, in earlier times when computer speed was an issue. Yours is nice and compact. I added "\." to the beginning of the search string and now it finds things like D4S-1.3.