Substituting text in TM with placeholder tag

Dear all,

I have a large TM, where the customer uses a character as separator between description to be translated. The files for translation are always in Excel format. I prefer working with the separator character transformed into a placeholder tag (embedded content --> placeholder), because then I can use the QA feature to tell me if one is missing, and also visually it is much clearer to have a tag than a symbol in such long segments. So I was wondering if there is a way to transform all separator characters in the TM into placeholders tags, in order to get better matches out of the TM. Maybe using a regex rule?

TIA

Sabina