[Bug 265480] std::regex constructor throwing an exception at backslash-underscore but not other invalid escapes

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=265480

            Bug ID: 265480
           Summary: std::regex constructor throwing an exception at
                    backslash-underscore but not other invalid escapes
           Product: Base System
           Version: 13.0-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: standards
          Assignee: standards@FreeBSD.org
          Reporter: cooperm@opentext.com

When passing to the std::regex constructor a pattern that include an escaped
underscore ("\_"), an exception is thrown with the explanation "The expression
contained an invalid escaped character, or a trailing escape."

This does not occur on non-FreeBSD systems, and it does not occur for several
other escapes that are normally invalid by regex convention (e.g., \& \= \/).

Is this intentional?

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