C＃正则表达式只允许字母和数字 [英] C# Regex to allow only alpha numeric

问题描述

我有以下的正则表达式 ^ [A-ZA-Z0-9] + $ 这将允许字母数字字符。这里的问题是，如果我只输入数字字符，如897687，那么正则表达式匹配依然。我不希望这样的事情发生。应的至少一个字母和它应该与字母开始。比如像A343或a98bder或a4544fgf343

I have the following regex ^[a-zA-Z0-9]+$ which would allow alpha numeric characters. The problem here is that if I enter only numeric character like "897687", then the regex still matches. I don't want that to happen. There should be at least one alphabet and it should start with an alphabet. For example like "a343" or "a98bder" or "a4544fgf343"

这将是巨大的，如果你能帮助我提高我对这个正则表达式。

It would be great if you could help me to improve my regex for this.

推荐答案

听起来像是你想要的：

^[a-zA-Z][a-zA-Z0-9]*$

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