You will need NOTEPAD++ for this one, or similar editor that supports reg expressions.
Make sure you have your list of keywords in a list that has been cleaned from duplicates.
1. Fire up NotePad++ and click on Edit > FIND & REPLACE
2. Next make sure that regular expression option is enabled and type in the following:
find what: ^.
replace with [
this will add [ in front of your keywords
find what: $
replace with ]
this will add ] in front of your keywords
4. the criteria for exact match on google adwords is [keyword] – enclosure by [ ] on both sides; the above gets it done in a few seconds.
5. Saving time = good!