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I have this regex where as you can see www. is optional
(https:\/\/)(?:www\.)?([^\.\/][\w.,@?^=%&:\/~+#-]*[\w@?^=%&\/~+#-])
But this regex would match
https://w.youtube.com
or
https://w...youtube.com
for example, because it would think that w. is a part of another group. But I want to prevent matching ww. or w. or w.... It should be www. or nothing at all.
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