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<?php $domainsToCheck = ["example3000.com", "m.example3000.com"]; function checkDomain($domain) { if (preg_match('/^([\p{L}\d\-]+)\.((?:[\p{L}\-]+\.?)+)$/ui', $domain, $m) === 1) { echo "{$domain} is good" . PHP_EOL; } else { echo "{$domain} is bad" . PHP_EOL; } } foreach ($domainsToCheck as $domain) { checkDomain($domain); }
Output for git.master, git.master_jit, rfc.property-hooks
example3000.com is good m.example3000.com is bad

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