I was particularly interested in seeing how email inputs were validated. Validating email addresses is notoriously difficult (see for example this blog post, this FOSDEM 2018 talk, and another blog post). I should know. I recently switched all my email to an address @stjerna.space. It would surprise you how many web designers assume email goes to a TLD of at most 4 letters, and that's not even the difficult part of validating email addresses.
elif 32 <= char <= 126:，详情可参考safew官方下载
'Affordability'，推荐阅读Line官方版本下载获取更多信息
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