2021-05-05 10:13:49 -07:00
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---
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id: 587d7db8367417b2b2512ba2
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title: 限制可能的用戶名
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challengeType: 1
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forumTopicId: 301363
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dashedName: restrict-possible-usernames
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---
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# --description--
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用戶名在互聯網上隨處可見。 它們是用戶在自己喜歡的網站上的唯一身份。
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需要檢索數據庫中的所有用戶名。 以下是用戶在創建用戶名時必須遵守的一些簡單規則。
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1) 用戶名只能是數字字母字符。
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2) 用戶名中的數字必須在最後。 數字可以有零個或多個。 用戶名不能以數字開頭。
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3) 用戶名字母可以是小寫字母和大寫字母。
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4) 用戶名長度必須至少爲兩個字符。 兩位用戶名只能使用字母。
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# --instructions--
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修改正則表達式 `userCheck` 以滿足上面列出的約束。
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# --hints--
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你的正則表達式應該匹配字符串 `JACK`
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```js
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2021-10-06 08:36:48 -07:00
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userCheck.lastIndex = 0;
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2021-05-05 10:13:49 -07:00
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assert(userCheck.test('JACK'));
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```
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你的正則表達式不應匹配字符串 `J`
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```js
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2021-10-06 08:36:48 -07:00
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userCheck.lastIndex = 0;
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2021-05-05 10:13:49 -07:00
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assert(!userCheck.test('J'));
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```
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你的正則表達式應該匹配字符串 `Jo`
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```js
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2021-10-06 08:36:48 -07:00
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userCheck.lastIndex = 0;
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2021-05-05 10:13:49 -07:00
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assert(userCheck.test('Jo'));
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```
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你的正則表達式應該匹配字符串 `Oceans11`
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```js
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2021-10-06 08:36:48 -07:00
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userCheck.lastIndex = 0;
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2021-05-05 10:13:49 -07:00
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assert(userCheck.test('Oceans11'));
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```
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你的正則表達式應該匹配字符串 `RegexGuru`
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```js
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userCheck.lastIndex = 0;
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2021-05-05 10:13:49 -07:00
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assert(userCheck.test('RegexGuru'));
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```
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你的正則表達式不應匹配字符串 `007`
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```js
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2021-10-06 08:36:48 -07:00
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userCheck.lastIndex = 0;
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2021-05-05 10:13:49 -07:00
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assert(!userCheck.test('007'));
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```
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你的正則表達式不應匹配字符串 `9`
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```js
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2021-10-06 08:36:48 -07:00
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userCheck.lastIndex = 0;
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2021-05-05 10:13:49 -07:00
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assert(!userCheck.test('9'));
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```
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你的正則表達式不應匹配字符串 `A1`
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```js
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2021-10-06 08:36:48 -07:00
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userCheck.lastIndex = 0;
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2021-05-05 10:13:49 -07:00
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assert(!userCheck.test('A1'));
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```
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你的正則表達式不應匹配字符串 `BadUs3rnam3`
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```js
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2021-10-06 08:36:48 -07:00
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userCheck.lastIndex = 0;
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2021-05-05 10:13:49 -07:00
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assert(!userCheck.test('BadUs3rnam3'));
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```
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你的正則表達式應該匹配字符串 `Z97`
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```js
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userCheck.lastIndex = 0;
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2021-05-05 10:13:49 -07:00
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assert(userCheck.test('Z97'));
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```
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你的正則表達式不應匹配字符串 `c57bT3`
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```js
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userCheck.lastIndex = 0;
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2021-05-05 10:13:49 -07:00
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assert(!userCheck.test('c57bT3'));
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```
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你的正則表達式應該匹配字符串 `AB1`
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```js
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userCheck.lastIndex = 0;
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2021-05-05 10:13:49 -07:00
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assert(userCheck.test('AB1'));
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```
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你的正則表達式不應匹配字符串 `J%4`
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```js
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userCheck.lastIndex = 0;
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assert(!userCheck.test('J%4'))
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```
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# --seed--
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## --seed-contents--
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```js
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let username = "JackOfAllTrades";
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let userCheck = /change/; // Change this line
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let result = userCheck.test(username);
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```
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# --solutions--
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```js
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let username = "JackOfAllTrades";
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const userCheck = /^[a-z]([0-9]{2,}|[a-z]+\d*)$/i;
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let result = userCheck.test(username);
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```
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