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正则表达式对username进行检查

 互联网上到处都在使用用户名。 它们为用户在他们最喜欢的网站上提供了独特的身份。


您需要检查数据库中的所有用户名。 以下是用户在创建用户名时必须遵循的一些简单规则。


1. 用户名只能使用字母数字字符。


2. 用户名中唯一的数字必须在末尾。 最后可以有零个或多个。 用户名不能以数字开头。


3. 用户名字母可以是小写和大写。


4. 用户名必须至少有两个字符长。 两个字符的用户名只能使用字母作为字符。


let username = "JackOfAllTrades"; const userCheck = /^[a-z]([0-9]{2,}|[a-z]+\d*)$/i; let result = userCheck.test(username);

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