RegExp метод test, почему true

var re = /((25[0-5]|2[0-4]\d|[01]?\d?\d)\.){3}(25[0-5]|2[0-4]\d|[01]?\d?\d)/; 
var str4 = "1300.6.7.8"; 
console.log(str4.match(re)); 
 
var re2 = /^(((25[0-5]|2[0-4]\d|[01]?\d?\d)\.){3}(25[0-5]|2[0-4]\d|[01]?\d?\d))$/; 
console.log(str4.match(re2)); 
console.log(re2.test(str4));

function isIPv4(ip) { 
  let parts = ip.split('.'); 
  if (parts.length !== 4) return false; 
  return parts.map(p => +p) 
       .every(p => p >= 0 && p < 256);     
} 
 
[ 
  '127.0.0.1', 
  '1.2a.3.4', 
  '256.0.0.0' 
].forEach(ip => console.log(ip, isIPv4(ip)));