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10 lines
343 B
PHP
10 lines
343 B
PHP
<?php
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function is_valid_domain_name($domain_name)
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{
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return (preg_match("/^([a-z\d](-*[a-z\d])*)(\.([a-z\d](-*[a-z\d])*))*$/i", $domain_name) && //valid chars check
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preg_match("/^.{1,253}$/", $domain_name) && //overall length check
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preg_match("/^[^\.]{1,63}(\.[^\.]{1,63})*$/", $domain_name)); //length of each label
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}
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?>
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