[Bug libstdc++/85472] Regex match bug

[timshen at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85472

Tim Shen <timshen at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |timshen at gcc dot gnu.org

--- Comment #1 from Tim Shen <timshen at gcc dot gnu.org> ---
As I cross checked, boost 1.66, libstdc++, and python3 have the same behavior,
only libc++ is different from the rest.

I haven't checked the ECMAScript spec, but I suspect that it describes the
boost/libstdc++/python behavior, only because it's more efficient, not less
confusing.

I know exactly how libc++ produces this result. It creates an empty
match_result during each repetition ("*" operator). It's less confusing but
much slower.