正则表达式匹配字母字符串并需要至少一个大写和一个小写(vb.net) [英] Regular expression to match alphabetic string and require at least one uppercase and one lowercase (vb.net)

问题描述

我正在尝试在 vb.net 中编写正则表达式字符串匹配.我试图实现的条件是字符串应该只包含字母，并且必须至少包含一个大小写字母.即 AAA-fail、aaa-fail、aAaA-pass.

I am trying to write a regular expression string match in vb.net. The condition that I am trying to implement is that the string should contain only alphabets and must contain atleast one letter of both lower and upper case. i.e AAA-fail, aaa-fail, aAaA-pass.

我想到的正则表达式是^(([az]+[AZ]+)+|([AZ]+[az]+)+)$

有人可以推荐一些更好/更简单的正则表达式吗?

Can someone suggest some better/simpler regular expression for the same?

推荐答案

您创建的正则表达式在某些情况下会失败，例如aAb".我认为以下方法更适合您:

The regex you created will fail under some conditions, such as "aAb". I think the following will work better for you:

^(?:[a-z]+[A-Z]+|[A-Z]+[a-z]+)(?:[a-zA-Z])*$

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