What's wrong with it is that you can't validate an email address using a regular expression - the syntax is too complex. But as an answer (or, indeed, a question) that's extraordinarily niche...
I would say it's fairly simple to validate-- just not with regex.
With regex; I'd just test ([^]+)@([^]{1,255}). Or with JS: /(.+)@(.{1,255})/su.
([^]+)@([^]{1,255})
/(.+)@(.{1,255})/su
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What's wrong with it is that you can't validate an email address using a regular expression - the syntax is too complex. But as an answer (or, indeed, a question) that's extraordinarily niche...
I would say it's fairly simple to validate-- just not with regex.
With regex; I'd just test
([^]+)@([^]{1,255}). Or with JS:/(.+)@(.{1,255})/su.