On: Some useful regular expressions for programmers

[anoncake]

Yes, there is. HTML does not define what email addresses look like. If input [type=email] rejects valid addresses, it's harmful garbage.

[eyelidlessness → anoncake]

Huh? My point is that if you expect user input from a browser’s input[type=email], you have little choice but to accept that it will reject emails not matching that pattern. Harmful garbage or not, a more permissive pattern won’t mitigate that.