RegEx函数用于在不使用库的情况下解析命令行

I would like to split up a string using a space as my delimiter, but if there are multiple words enclosed in double or single quotes, then I would like them to be returned as one item.

我想使用空格作为我的分隔符来拆分字符串,但是如果有多个单词用双引号或单引号括起来,那么我希望它们作为一个项返回。

For example if the input string is:

例如,如果输入字符串是:

CALL "C:\My File Name With Space" /P1 P1Value /P1 P2Value

CALL“C:\ My Space Name with Space”/ P1 P1Value / P1 P2Value

The output array would be:

输出数组将是:

Array[0]=Call
Array[1]=C:\My File Name With Space
Array[2]=/P1
Array[3]=P1Value
Array[4]=/P1
Array[5]=P2Value

How do you use regular expressions to do this? I realize that there are command line parsers. I took a cursory look at a popular one, but it did not handle the situation where you can have multiple parameters with the same name. In any event, instead of learning how to use a command line parsing library (leave that for another day). I'm interested in getting exposed more to RegEx functions.

你如何使用正则表达式来做到这一点?我意识到有命令行解析器。我粗略地看了一下流行的一个,但它没有处理你可以有多个具有相同名称的参数的情况。无论如何,而不是学习如何使用命令行解析库(将其留在另一天)。我有兴趣更多地了解RegEx功能。

How would you use a RegEx function to parse this?

你会如何使用RegEx函数来解析它?

3 个解决方案

#1

The link in Jim Mischel's comment points out that the Win32 API provides a function for this. I'd recommend using that for consistency. Here's a sample (from PInvoke).

Jim Mischel评论中的链接指出Win32 API为此提供了一个功能。我建议使用它来保持一致性。这是一个样本(来自PInvoke)。

static string[] SplitArgs(string unsplitArgumentLine)
{
    int numberOfArgs;
    IntPtr ptrToSplitArgs;
    string[] splitArgs;

    ptrToSplitArgs = CommandLineToArgvW(unsplitArgumentLine, out numberOfArgs);
    if (ptrToSplitArgs == IntPtr.Zero)
        throw new ArgumentException("Unable to split argument.",
          new Win32Exception());
    try
    {
        splitArgs = new string[numberOfArgs];
        for (int i = 0; i < numberOfArgs; i++)
            splitArgs[i] = Marshal.PtrToStringUni(
                Marshal.ReadIntPtr(ptrToSplitArgs, i * IntPtr.Size));
        return splitArgs;
    }
    finally
    {
        LocalFree(ptrToSplitArgs);
    }
}

[DllImport("shell32.dll", SetLastError = true)]
static extern IntPtr CommandLineToArgvW(
    [MarshalAs(UnmanagedType.LPWStr)] string lpCmdLine,
    out int pNumArgs);

[DllImport("kernel32.dll")]
static extern IntPtr LocalFree(IntPtr hMem);

If you want a quick-and-dirty, inflexible, fragile regex solution you can do something like this:

如果你想要一个快速,肮脏,不灵活,脆弱的正则表达式解决方案,你可以做这样的事情:

var rex = new Regex(@"("".*?""|[^ ""]+)+");
string test = "CALL \"C:\\My File Name With Space\" /P1 P1Value /P1 P2Value";
var array = rex.Matches(test).OfType<Match>().Select(m => m.Groups[0]).ToArray();

#2

I wouldn't do it with Regex, for various reasons shown above.

由于上面显示的各种原因,我不会使用正则表达式。

If I did need to, this would match your simple requirements:

如果我确实需要,这将符合您的简单要求:

(".*?")|([^ ]+)

However, this doesn't include:

但是,这不包括:

Escaped quotes
Single quotes
non-ascii quotes (you don't think people will paste smart quotes from word into your file?)

非ascii引号(你不认为人们会将单词中的智能引号粘贴到你的文件中吗?)

combinations of the above

以上的组合

And that's just off the top of my head.

而这只是我的头脑。

#3

@chad Henderson you forgot to include the single quotes, and this also have the problem of capturing anything that comes before a set of quotes.

@chad Henderson你忘了包含单引号,这也有捕获一组引号之前的任何内容的问题。

here is the correction including the single quotes, but also shows the problem with the extra capture before a quote. http://regexhero.net/tester/?id=81cebbb2-5548-4973-be19-b508f14c3348

这里是包含单引号的更正,但也显示了报价前额外捕获的问题。 http://regexhero.net/tester/?id=81cebbb2-5548-4973-be19-b508f14c3348

#1