如何防止用户输入中极其恼人的代码[关闭]

Question

Is it possible to prevent characters that break the layout? Like this:

̤͎͍͖̳̙͚̭͕̠̤͎͍͖̳̙͚̭͕̠S̳͇͉̩̳ S̳͇͉̩̳ ̤͎͍͖̳̙͚̭͕̠S̳͇͉̩̳̤͎͍͖̳̙͚̭͕̠S̳͇͉̩̳

̤͎͍͖̳̙͚̭͕̠̤͎͍͖̳̙͚̭͕̠S̳͇͉̩̳̤͎͍͖̳̙͚̭͕̠S̳͇͉̩̳̤͎͍͖̳̙͚̭͕ ̠S̳͇͉̩̳

S̳͇͉̩̳̤͎͍͖̳̙͚̭͕̠S̳͇͉̩̳

Answer 1

You can prevent it by whitelisting UTF8 chars from a limited range, for example only the latin code points, see http://www.utf8-chartable.de/ for the hex values.