Hello All!

I've run into a problem trying to update the version ANTLR that
SCIMple uses.  It looks like something changed just after 4.5.3.

After digging into it for a few hours, I'm still scratching my head.
I don't know enough about ANTLR "modes" to be useful.

I created a stand-alone example that reproduces the issue.  I'll ask
for help in the ANTLR mailing list, but I figured I'd pass it around
here in case any of the original authors have any ideas.

https://github.com/bdemers/antlr-problem (see README for instructions,
TL;DR `mvn verify`)

TL;DR: The phone number "tel:+358-4x-123-4" failed to parse on
previous versions.  With current versions, it parses to: "tel:+358-4"
(The previous versions would raise an error on the `x`, whereas the
newer versions seem to ignore it?)

Any help in rephrasing this problem would be appreciated too.

-Brian

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