function formatSocialSecurity(val){
    val = val.replace(/\D/g, '');
    val = val.replace(/^(\d{3})/, '$1-');
    val = val.replace(/-(\d{2})/, '-$1-');
    val = val.replace(/(\d)-(\d{4}).*/, '$1-$2');
    return val;
}          
formatSocialSecurity("135711458");//"135-71-1458"