Robin,

           I have also written to VFO technical support about what the regular expression matching and substitution capabilities of JAWS 2018 are.   I am as close to certain as I can be that I have used this technique in a JAWS speech dictionary in earlier versions of JAWS but I'll be darned if I could find where it's stashed today.

           I absolutely know that NVDA can do it, and I fail to believe that my memory of having done so at one time with JAWS is incorrect (but I will probably be proven to be wrong).
--

Brian - Windows 10 Home, 64-Bit, Version 1803, Build 17134  

    The real art of conversation is not only to say the right thing in the right place but to leave unsaid the wrong thing at the tempting moment.

          ~ Dorothy Nevill