关于C＃正则表达式的问题？ [英] Question about C# regex?

问题描述

大家好，我需要制作一个模式，这是我的第一个程序，我使用这个正则表达式的东西，我不太熟悉它，基本上我需要让字符串有更好的空间，但如果我把它放在模式中，对于正则表达式，这意味着，它必须有一个空格，所以如何制作，正则表达式不关心是否有空格？

和我也需要允许/和\，



所以如何在正则表达式的字符串中允许，/和\基本上跳过它们？

i希望你理解我。有关更多信息，请问我。 tnx提前。



btw \这意味着必须有空格：/这对我没用。

解决方案

取决于你想要做什么 - 从你的描述中不清楚。

为了匹配你的空白收藏很容易：

< pre lang =text> [\\\\\ /]

将匹配任何一个角色，并且

 [^ \\\\\ /] 

将匹配任何不属于它们的字符。



但是没有代码说忽略这些字符，无论它们在字符串中的哪个位置 - 对于那种情况，你最好在将数据传递给正则表达式进行匹配之前，使用C＃中的string.Replace删除它们。



如果你打算使用正则表达式，那么得到一份 Expresso [ ^ ] - 它是免费的，它会检查并生成正则表达式。我经常使用它！

试试这个：

  string  input =  这是一个带空格的输入字符串。; 
  if （Regex.IsMatch（输入， @  [/ \\]））
 {
  //  字符串包含空格，斜杠或反斜杠或它们的混合 
} 
  else  
 { 
  //  字符串不包含任何字符 
} 

其他人已经回答了您的具体问题，但我想指出一些可以帮助您学习RegEx的网站。

A非常有用的网站是 regexlib [ ^ ];他们有一个庞大的正则表达式库。他们还有一个 RegEx测试人员 [ ^ ]，这在尝试查看您的reg ex实际执行的操作时非常有用。此外，还有一个非常有用的RegEx工具此处 [ ^ ]。

Hi guys, i need to make a pattern, this is my first program where i use this regex thing and I'am not much familiar with it, basically i need to allow the string to have space ot better " ", but if i put that in the pattern, for the regex, that means, it must have a whitespace, so how to make, for regex to dont care if there is a whitespace or not?
and i also need to allow "/" and "\",

so how to allow " ", "/" and "\" in the string for the regex basically to skip them?
i hope you understand me. for more info ask me. tnx in advance.

btw \s means must have whitespace :/ which is not useful for me.

解决方案

Depends on what you are trying to do - and it isn't clear from your description.
To match your "whitespace" collection is easy:

[\s\\/]

will match any character which is any one of them, and

[^\s\\/]

will match any character which is none of them.

But there isn't a code which says "ignore these characters, regardless of where they are in the string" - for that kind of thing, you are better off using string.Replace in C# to remove them before passing the data to a Regex for matching.

And if you are going to work with regexes, then get a copy of Expresso [^] - it's free, and it examines and generates Regular expressions. I use it a lot!

Try this:

string input = "This is an input string with spaces.";
if (Regex.IsMatch(input, @"[ /\\]"))
{
    // string contains a space, a slash, or a backslash or a mix of them
}
else
{
    // string does not contain any of those chars
}

The others have already answered your specific question, but I wanted to point out a couple sites that will help you to learn RegEx.
A very helpful site is regexlib[^]; they have a large library of Regular Expressions. They also have a RegEx tester[^], which is very useful when trying to see what your reg ex actually does. Also a very useful RegEx tool is available here[^].

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