c# - 比较忽略换行符和空格的两个字符串

Question

我需要比较两个忽略空格和换行符的字符串，因此以下字符串应该相等：

"Initial directory structure.\r\n    \r\n    The directory tree has been changed"
"Initial directory structure.\n\nThe directory tree has been changed"

我该如何实施？

Answer 1

怎么样：

string stringOne = "ThE    OlYmpics 2012!";
string stringTwo = "THe\r\n        OlympiCs 2012!";

string fixedStringOne = Regex.Replace(stringOne, @"\s+", String.Empty);
string fixedStringTwo = Regex.Replace(stringTwo, @"\s+", String.Empty);

bool isEqual = String.Equals(fixedStringOne, fixedStringTwo,
                              StringComparison.OrdinalIgnoreCase);

Console.WriteLine(isEqual);
Console.Read();

Answer 2

另一种方法是使用 String.Compare 的 CompareOptions。

CompareOptions.IgnoreSymbols

指示字符串比较必须忽略符号，例如空格字符、标点符号、货币符号、百分号、数学符号、和号等。

String.Compare("foo\r\n   ", "foo", CompareOptions.IgnoreSymbols);

https://docs.microsoft.com/en-us/dotnet/api/system.globalization.compareoptions

Answer 3

然后复制字符串

xyz.Replace(" ", string.Empty);
xyz.Replace("\n", string.Empty);

Answer 4

怎么样：

string compareA = a.Replace(Environment.NewLine, "").Replace(" ", "");
string compareB = b.Replace(Environment.NewLine, "").Replace(" ", "");

然后你可以比较两者。

也许把它扔到一个辅助函数中：

public bool SpacelessCompare(string a, string b){
    string compareA = a.Replace(Environment.NewLine, "").Replace(" ", "");
    string compareB = b.Replace(Environment.NewLine, "").Replace(" ", "");

    return compareA == compareB;
}

Answer 5

myString = myString.Replace("", "Initial directory structure.\r\n    \r\n    The directory tree has been changed");

现在只需检查它们是否相等。

String.Compare(myString, "Initial directory structure.The directory tree has been changed")

Answer 6

另一种变体，灵活（添加任何跳过字符），无需修改原始字符串或创建新字符串。

string str = "Hel lo world!";
string rts = "Hello\n   world!";
char[] skips = { ' ', '\n' };

if (CompareExcept(str, rts, skips))
    Console.WriteLine("The strings are equal.");
else
    Console.WriteLine("The strings are not equal.");


static bool CompareExcept(string str, string rts, char[] skips)
{
    if (str == null && rts == null) return true;
    if (str == null || rts == null) return false;

    var strReader = new StringReader(str);
    var rtsReader = new StringReader(rts);
    char nonchar = char.MaxValue;

    Predicate<char> skiper = delegate (char chr)
    {
        foreach (var skp in skips)
        {
            if (skp == chr) return true;
        }
        return false;
    };

    while (true)
    {
        char a = strReader.GetCharExcept(skiper);
        char b = rtsReader.GetCharExcept(skiper);

        if (a == b)
        {
            if (a == nonchar) return true;
            else continue;
        }
        else return false;
    }
}

class StringReader : System.IO.StringReader
{
    public StringReader(string str) : base(str) { }

    public char GetCharExcept(Predicate<char> compare)
    {
        char ch;

        while (compare(ch = (char)Read())) { }

        return ch;
    }
}