We prefer to provide a more error-proof regex.

Revert "Merge pull request #16136 from gitmai/bug-970320-CC-add-movistar-uruguay"

This reverts commit a5099dd1cc3e6761022b979bb58d2d29744a61d8, reversing
changes made to bf1b832d29f0caf5bb4478f681fbc145b4968c7b.