C＃中的正则表达式问题 [英] Issue with regular expression in C#

问题描述

你好朋友，



我正在尝试在C＃中为用户名创建一个正则表达式。我的要求是：



- 用户名可以是一个单词或两个单词，只有一个空格或点或下划线之间的字符，例如代码项目，code.project，code_project。不允许使用其中任何一种角色。



- 它不应该接受任何其他特殊字符。



我创建了这个正则表达式： @^（[aA0-zZ9] * [\\\\.\ _]？[aA0-zZ9] *）$



但是默认情况下，这是接受多个 UNDERSCORE 和 @ （一个或多个）字符。我不希望它接受一个下划线字符b / w两个单词。也不应该允许 @ 。我没有把它包含在Regex中。它来自哪里???



任何帮助都会很棒。



在此先感谢，

Gobind

解决方案

但这是接受多个 UNDERSCORE 和 @ （一个或多个）字符默认。我不希望它接受一个下划线字符，而不是两个单词。也不允许 @ 。我没有把它包含在Regex中。它来自哪里？



任何帮助都会很棒。



先谢谢，

Gobind

试试这个：

 ^ [a-zA-Z0-9] +（[._ \ s] [a -Za-Z0-9] +）？

hello friends,

I'm trying to create a regular expression in C# for the user name. My requirement is:

- User name can be of one word or of two words with exactly one space or dot or underscore character between them e.g. code project, code.project, code_project. more than one of any of these character is not allowed.

- It should not accept any other special characters.

I created this regex: @"^([aA0-zZ9]*[\s\.\_]?[aA0-zZ9]*)$"

But this is accepting more than one UNDERSCORE and @ (one or more than one) character by default. I don't want it to accept exactly one underscore character b/w two words. also @ should not be allowed. I have not included it in Regex. where does it came from???

Any help would be great.

Thanks in Advance,
Gobind

解决方案

"

But this is accepting more than one UNDERSCORE and @ (one or more than one) character by default. I don't want it to accept exactly one underscore character b/w two words. also @ should not be allowed. I have not included it in Regex. where does it came from???

Any help would be great.

Thanks in Advance,
Gobind

Try this:

^[a-zA-Z0-9]+([._\s][a-zA-Z0-9]+)?

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