Is it even possible to remove backslashes in an HL7 xlate?

We are CIS 5.7R1 on AIX.

I’m probably just making this too hard.  Trying to copy the free-text Chief Complaint from the appropriate DG1 component to PV2-3 where Cerner likes to see it as the Reason For Visit and remove a creative user’s backslash…

xlateInVals = SOME PHRASE LIKE THIS

using the COPY pre-proc of

regsub -all {\} $xlateInVals {} xlateOutVals

xlateOutVals = SOME

Okay, I’ve commited the cardinal Cloverleaf sin of not treating xlateInVals as a list…so I change to

regsub -all {\}

{} xlateOutVals

xlateOutVals = SOME PHRASE LIKE THIS

Ta-da!  Well, not quite mon hombre…When testing

xlateInVals = SOME PHRASE LIKE THIS or,

xlateInVals = SOME PHRASE LIKE THIS

without the backslash or with it elsewhere than the end, I get

xlateOutVals = {SOME PHRASE LIKE THIS}

with those pesky curly braces.  I tried using string map and got strange  results too:

set xlateOutVals [string map {{\} {}}

]

SOME PHRASE LIKE THIS => {SOME PHRASE LIKE THIS}

SOME PHRASE LIKE THIS => {SOME PHRASE LIKE THIS}

and my favorite, the original culprit:

SOME PHRASE LIKE THIS => SOME PHRASE LIKE THIS

All this was done in the Xlate Testing Tool.

Any assistance would be much appreciated.