Revision: 34598
                            
                                                            
                                    
                                        
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                        at October 26, 2010 02:58 by newsok
                            
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$url = "http://komunitasweb.com/";
if (preg_match('/^(http|https|ftp)://([A-Z0-9][A-Z0-9_-]*(?:.[A-Z0-9][A-Z0-9_-]*)+):?(d+)?/?/i', $url)) {
    echo "Your url is ok.";
} else {
    echo "Wrong url.";
}
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Validate Domain Name
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PHP