At least temporarily fix GH #1314
At least temporarily fix GH #1314

- Regex ~~ Callable is True, that's why it is trying to call it
- adding a Regex candidate for start did *not* fix the issue
- I assume that somehow the coercing makes the candidate narrower
- so fixed by checking for Regex then and there

It should be noted that this reminded me of an issue that the sub version
of an action should call the method version, not the other way around.
"substr" and others are cases where we didn't fix this yet.  Should maybe
looked at after the 2017.12 release.

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