fix DNS validation

src/Handlers/AbstractDnsHandler.php

@@ -88,26 +88,12 @@ protected function validateHostName(string $hostName): void
 
         $hostnameErrorInfo = 'Invalid hostname ' . json_encode($hostName);
 
-        if (strlen($hostName) < 3) {
+        if (!filter_var($hostName, FILTER_VALIDATE_DOMAIN)) {
             throw new DnsHandlerException(
-                $hostnameErrorInfo . ' length. It must be 3 or more!',
-                DnsHandlerException::HOSTNAME_LENGTH_TOO_SMALL
-            );
-        }
-
-        if (!preg_match(Regex::DOMAIN_OR_SUBDOMAIN, $hostName)) {
-            throw new DnsHandlerException(
-                $hostnameErrorInfo . ' format! (characters "A-Za-z0-9.-", max length 63 chars allowed)',
+                $hostnameErrorInfo . ' format!',
                 DnsHandlerException::HOSTNAME_FORMAT_INVALID
             );
         }
-
-        if (!preg_match(Regex::HOSTNAME_LENGTH, $hostName)) {
-            throw new DnsHandlerException(
-                $hostnameErrorInfo . ' length! (min 3, max 253 characters allowed)',
-                DnsHandlerException::HOSTNAME_LENGTH_INVALID
-            );
-        }
     }
 
     /**

src/Records/DnsUtils.php

@@ -13,7 +13,7 @@ public static function isValidDomainOrSubdomain(string $domain): bool
         if (empty($domain) || strlen($domain) < 4) {
             return false;
         }
-        return preg_match(Regex::DOMAIN_OR_SUBDOMAIN, $domain) === 1;
+        return (bool) filter_var($domain, FILTER_VALIDATE_DOMAIN);
     }
 
     public static function ipV6Shortener(string $ipv6): string

src/Records/ExtendedTxtRecords.php

@@ -103,7 +103,7 @@ public function isParentHostName($host): bool
      */
     private function isDomainOrSubdomainHostName(string $host): bool
     {
-        return preg_match(Regex::DOMAIN_OR_SUBDOMAIN, $host) === 1;
+        return (bool) filter_var($host, FILTER_VALIDATE_DOMAIN);
     }
 
     private function isDomainKeyHostName(string $host): bool

src/Regex.php

@@ -4,9 +4,6 @@
 
 class Regex
 {
-    public const DOMAIN_OR_SUBDOMAIN = '/^(([\w\d\_\-]+){1,63}\.)+(\w+){2,63}$/i';
-    public const HOSTNAME_LENGTH = '/^.{3,253}$/';
-
     public const SPF_VALIDATION = '/^v=spf1 ([a-z0-9:.\/ ~\-_\+]+)/i';
 
     public const DKIM_SELECTOR_VALUE = '/^([\w\_]+)\._domainkey.*/';