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I can't seem to reproduce this. I tried the following
Create the TDS based on an extract
Add it to a new workbook as a new data source
Add it to a new workbook as a data source through another workbook that had the TDS in it.
In 9.0 both cases still offered the regex options in the calculation editor and the fields I had generated earlier and saved in the data source also worked.
Can you check if TDS is using extract vs the base connection? (is Use Extract option checked)