Use REPLACE to strip out the punctuation and write it to another column? Didn't you post the previous stuff about this under your other account, Wendy Elizabeth? Did you use NGrams that Alan Burstein recommended?
You talk about the same topics, have the same speech patterns, ask the same questions... so you're the same person. Right?
The original post is
here
I remember reading that thread as it developed. I thought Alan's solution for it was excellent.