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This addresses some issues raised by #2267 and #2205 with email addresses not supporting subdomains.
While I'm not completely certain the regex needs to retain this level of complexity (I think it supports IPv6 which is impressive yet... wild) it now supports the potentially slightly more likely situation of an email address for a subdomain which is entirely valid.
The changes in the deno README seem to be attributed to the commit hooks; they were likely forgotten on a previous merge.
I'm aware that this might overlap with the work on simplifying the email regex in which case, feel free to reject this PR.