Fix problem with regex constructor #1552
Merged
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The spec for ES6 says that we can create a new regex passing an existing one and a different set of flags, but that does not work. This PR fixes it (while keeping the old behavior for ES5 and below). We also now pass a few more test262 cases.
Spec link: https://tc39.es/ecma262/multipage/text-processing.html#sec-regexp-constructor
(If accepted, please squash this PR 🙂 )