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A regexp with N sets of capturing parens will have N+1 capture groups, with the extra capture containing the entire matching string. Our old implementation stored `parenCount` in the RegExpShared and then added 1 to it whenever it was used. A much simpler answer is to just add 1 when initializing the regexp. Differential Revision: https://phabricator.services.mozilla.com/D70693 --HG-- extra : moz-landing-system : lando
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