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Add regression test for recent regex(3) breakage

Description

Add regression test for recent regex(3) breakage

BREs recently became prematurely sensitive to the branching operator, which
outright broke expressions that used it instead of failing silently. Test
that \| is matching a literal | for the time being.

Reviewed by: cem, emaste, ngie
Approved by: emaste (mentor)
Differential Revision: https://reviews.freebsd.org/D11577

Details