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jQuery url Validation

When  lost focus  from the input box the script will check the URL against its Syntax

$(‘input’).keydown(function() {
        if (ischeckUrl($(this))==1){
            alert(“enter a valid url…”);   
        }
});
//function to check URL
function isCheckUrl(checkurl){
    if(/^(http|https|ftp)://[a-z0-9]+([-.]{1}[a-z0-9]+)*.[a-z]{2,5}(:[0-9]{1,5})?(/.*)?$/i.test(url)) {
      return 1;
    } else {
      return -1;
    }   
}

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