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<?php $domain_name = "президент.рф"; $domain_name = idn_to_ascii($domain_name); function is_valid_domain_name($domain_name) { return (preg_match("/^([a-z\d](-*[a-z\d])*)(\.([a-z\d](-*[a-z\d])*))*$/i", $domain_name) //valid chars check && preg_match("/^.{1,253}$/", $domain_name) //overall length check && preg_match("/^[^\.]{1,63}(\.[^\.]{1,63})*$/", $domain_name) ); //length of each label } echo is_valid_domain_name($domain_name) ? "Domain is valid." : "Domain is not valid."; ?>
Output for git.master, git.master_jit, rfc.property-hooks
Domain is valid.

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