bmakowski/preg_match_domain_name.php

## preg_match_domain_name.php
<?php

if( !preg_match('/^(?!\-)(?:[a-zA-Z\d\-]{0,62}[a-zA-Z\d]\.){1,126}(?!\d+)[a-zA-Z\d]{1,63}$/', $domain) ){
  // didn't match return error
  return false;
}
	<?php

	if( !preg_match('/^(?!\-)(?:[a-zA-Z\d\-]{0,62}[a-zA-Z\d]\.){1,126}(?!\d+)[a-zA-Z\d]{1,63}$/', $domain) ){
	// didn't match return error
	return false;
	}