How Do I Replace Text with Number using RegEx?

My apologies for revising the Topic Title with incorrect text. Your OP seemed to indicate you were trying to replace month name, but now with you last post I see you are simply look to replace any arbitrary text with a number.

So, I have revised the Topic Title again. Feel free to change if this does not accurately reflect your request.

Now that you have clarified your objective, I can provide a better solution. I have moved my prior post to a new topic. I'll post back soon with another solution.

Meanwhile, Please read:
Tip: How Do I Get The Best Answer in the Shortest Time?