的正则表达式名？ [英] Regex for Username?

问题描述

我使用C＃和jQuery用正则表达式有效的用户名。刚学:)到目前为止，我有

I am using C# and jQuery to valid a username with Regex. Just learning :) So far I have

UserName = "[a-zA-Z0-9]";

但是，这并不能阻止符号？如何确保没有符号或。或_？

But this doesn't stop symbols ? How to ensure that no symbols or " . " or " _ " ?

感谢

推荐答案

这正则表达式说：至少一个字母或数字你要从开始到结束的每一个字符是字母或数字

That regex says "At least one letter or number" you want "Every character from the start to the end is a letter or number"

"^[a-zA-Z0-9]+$"

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