I figured something out, at least. I had forgotten to use backslashes
before the hyphens in the [...]s. That makes the matches link together
as expected, but it still doesn't make "s(ec(ond)?)?" match "sec" like
it should. It just matches "s".
For example, with std.regex, the following regex doesn't match the full
string below it.
(\d+([\.\-\s_']|and|m(in(ute)?s?)?|s(ec(ond)?s?)?)*){1,3}
9min59sec24
It does match on http://regextester.com . This is pretty clearly a bug
at this point. I don't see what else I could be doing wrong.
