My first post in this thread pointed out there is NO inherent distinction. Any distinction would have to be imposed by you, the designer. Any distinction we come up with would be arbitrary and thus have limitations, so we can't answer your question.
We really can't help you until you explain what \dth\d\file.txt should become.
- Should the first "\" should be escaped?
- Yes? What if the user wants to match "4th..." and "5th...", but not "\dth..."?
- No? What if the user wants to match "\dth...", but not "4th..." and "5th..."?
- Should the second "\" should be escaped?
- Yes? What if the user wants to match "...th4..." and "...th5...", but not "...th\d..."?
- No? What if the user wants to match "...th\d...", but not "...th4..." and "...th5..."?
- Should the "." should be escaped?
- Yes? What if the user wants to match "...file_txt"?
- No? What if the user doesn't want to match "...file_txt"?
We can show you how if you tell us what you want, but you haven't given us nearly enough information.
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