You could replace:
[ a-zA-Z]@[,0-9]
with:
[0-9].[!,0-9]@[,0-9^t^l^13]
With this expression, the formatting will stop before a comma, number, tab, manual line break or paragraph break - whichever comes first.

__________________
Cheers,
Paul Edstein
[Fmr MS MVP - Word]