Nodejs IP Address Format Check ipv4Address()

Method Source Code

String.prototype.ipv4Address = function() {
  return /^(([1-9]?\d|1\d\d|2[0-4]\d|25[0-5])(\.(?!$)|$)){4}$/.test(this);
};

Related

1. ipv4Address()

   String.prototype.ipv4Address = function() {
     return /^(([1-9]?\d|1\d\d|2[0-4]\d|25[0-5])(\.(?!$)|$)){4}$/.test(this);
   };
   

2. ipv4Address()

   String.prototype.ipv4Address = function() {
     var ipv4 = this;
     if(ipv4.trim().length!=ipv4.length) return false;
     var arr = ipv4.split('.');
     if(arr.length!=4) return false;
     for(var i=0; i<arr.length; i++){
       if(!(checkWhiteSpace(arr[i]) && checkLeadZero(arr[i]) && checkForNum(arr[i]))){
         return false;
     return true;
   };
   function checkWhiteSpace(str){
     return str.trim().length == str.length;
   function checkLeadZero(str){
     if(str.length==1) return true;
     if(str.charAt(0)==0) return false;
     if(str.charAt(0)=='+') return false;
     else return true;
   function checkForNum(str){
     var num = parseInt(str);
     if(num>=0 && num<=255) {
       return true;
     }else {
       return false;
   

3. ipv4Address()

   String.prototype.ipv4Address=function(){
     var newArr = this.split('.');
     if(newArr.length !== 4){
       return false;
     var test1 = this.split('.').join('');
     var regexp = new RegExp("\\D+", "g");
     if(regexp.test(test1) === true){
       return false;
   ...