题解 | #合法IP#
合法IP
https://www.nowcoder.com/practice/995b8a548827494699dc38c3e2a54ee9
正则表达式的运用 完整代码如下：
const rl = require("readline").createInterface({ input: process.stdin });
var iter = rl[Symbol.asyncIterator]();
const readline = async () => (await iter.next()).value;
void async function () {
// Write your code here
while(line = await readline()){
let output = 'YES';
let arr = line.split('.').filter(Boolean);
if (line.match(/\s/g)) {
output = "NO";
}
if (Math.min(...arr) < 0 || Math.max(...arr) > 255) {
output = 'NO'
}
if (arr.length != 4) {
output = 'NO'
}
for (let i = 0; i < arr.length; i++) {
if (arr[i].toString().match(/^[0\+\-]\d+$/)) {
output = 'NO'
}
}
console.log(output);
}
}()
