3v4l.org

run code in 300+ PHP versions simultaneously
<?php $domainPart = ' domain.com'; $regexChar = '/^[\x{0100}-\x{017f}]{1,63}$/iu'; preg_match($regexChar, $domainPart, $matches); print_r($matches);
Output for 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.34, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.25, 8.4.1 - 8.4.12
Array ( )
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127.49 ms | 408 KiB | 5 Q