[PR 61424] std::regex matches right to left, not leftmost longest

[Tim Shen]

Here's a patch that is a little bit "quick & dirty". In BFS mode it's
not trivial to support ECMAScript's
"match from left to right". A quick solution is only using DFS for
ECMAScript. See the patch.

It is possible to support ECMAScript's "left to right" in BFS mode
(re2 does this), but I didn't see an obvious way. We could take a look
at re2.

Bootstrap & tested.

Thank you!


-- 
Regards,
Tim Shen
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