Ok. I have a spreadsheet with 50,000 user names in column one. I would like to search for any usernames that have a particular setup. I would like to find all of the usernames that are three letters, followed by four numbers...they could be any letters or numbers, just in that certain pattern. I don't know how to conduct this search.

I have scoured the internet, but am not able to find an answer... I hope someone can help me..

Thanks