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@ 2020-09-18T13:52:42Z

<?php

$key = "WiktorStribiżew";
if(preg_match("~^\p{Latin}+$~u", $key)){
  echo "$key is valid!";
} else {
  echo "$key is invalid!";
}

Output
Performance
VLD
References
Branches

preg_match: documentation ( source)

preferences:dark modelive preview

60.35 ms | 402 KiB | 5 Q