James E. Blair d4fac1a0e8 Register RE2 syntax errors as warnings
This adds a configuration warning (viewable in the web UI) for any
regular expressions found in in-repo configuration that can not
be compiled and executed with RE2.

Change-Id: I092b47e9b43e9548cafdcb65d5d21712fc6cc3af
2023-08-28 15:04:49 -07:00
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