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@ 2018-09-20T20:02:47Z

<?php

$domainPart = ' domain.com';

$regexChar = '/^[\x{0100}-\x{017f}]{1,63}$/iu';

preg_match($regexChar, $domainPart, $matches);

print_r($matches);

Output
Performance
VLD
References
Branches

preg_match: documentation ( source)
print_r: documentation ( source)

preferences:dark modelive preview

50.04 ms | 402 KiB | 5 Q