I have no clue whether this is known, but this looks a heck
of a lot like a bug to me.
A /g match is supposed to start where the previous one left
off. Not before it.
Also FYI the intent is to preserve backwards compatibility.
If that didn't happen, it is generally by accident. (There
are some exceptions to this rule where backwards
compatibility is ruled not important enough, but they are
rather few in number.)
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