<pre class="shiki github-dark shaku"><code>/** * @param {string} str * @return {boolean} */function isValidIP(str){ const ipv4Reg = /\d+(?=\.)/g; const ipv6Reg = /[0-9a-zA-Z]+(?=\:)/g if(ipv4Reg.test(str)){ const matchNum = str.split('.'); if(matchNum.length !== 4){ return false; } else { for(let num of matchNum){ if(num === '00' || isNaN(parseInt(num)) || Number(num) !==0 &amp;&amp; (num.startsWith('0')) || Number(num)&gt;255){ return false; } } return true; } } else if (ipv6Reg.test(str)){ const matchNum = str.split(':'); if(matchNum.length!==8){ return false; } else { for (let _item of matchNum) { const item = _item.toLowerCase(); const num = parseInt(item, 16); if (isNaN(num)) return false; if (num &lt; 0 || num &gt; 0xffff) return false; if (num.toString(16).padStart(item.length, '0') !== item) return false; } return true; } } return false;}</code></pre>

This is my accepted solution

IPV4 An IPv4 Address is represented in dot-decimal notation, consisting of 4 numbers( called 'octet'), each ranging from 0 to 255, like 1.22.33.255. I…