题解 | #找出字符串中第一个只出现一次的字符#
找出字符串中第一个只出现一次的字符
https://www.nowcoder.com/practice/e896d0f82f1246a3aa7b232ce38029d4
//正则表达式全局搜索第一个长度为1的字符
const readline = require("readline");
const rl = readline.createInterface({
input: process.stdin,
output: process.stdout,
});
rl.on("line", function (line) {
let strCounts = [];
if (line.length > 0) {
let res = "-1";
for (let str of line) {
let len = line.match(new RegExp(str, 'g')).length;
if (len == 1) {
res = str;
break;
}
}
console.log(res);
}
});
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