计算字符串 C# 中单词之间的制表符

Question

我需要计算字符串中单词之间的制表符数量

string s = "DATE\t\t\tVERSION\t\tAUTHOR\t\t\t\t\tCOMMENTS";


int TabsDateVersion;     //number of tabs between "Date" and "Version"
int TabsVersionAuthor;   //number of tabs between "Version" and "Author"
int tabsAuthorComments;  //number of tabs between "Author" and "Comments"

注意：单词仅由一个或多个制表符分隔。

知道如何在 C# 中执行此操作，所以我有 3 个不同的计数吗？

Answer 1

如果字符串有制表符（而不是表示制表符的 4 个空格），您可以使用 LINQ 轻松计数

var s = "DATE,      VERSION             AUTHOR      COMMENTS";

Console.WriteLine(CountTabs(s,"DATE","VERSION"));
Console.WriteLine(CountTabs(s,"VERSION","AUTHOR"));
Console.WriteLine(CountTabs(s,"AUTHOR","COMMENTS"));

public static int CountTabs(string source, string fromVal, string toVal)
{
    int startIdx = source.IndexOf(fromVal);
    int endIdx = source.IndexOf(toVal);

    return source.Skip(startIdx).Take(endIdx - startIdx).Count(c => c == '\t');
}

Note: No error handling if fromVal and toVal is not part of source.

Answer 2

使用有关如何从 this 答案中获取单词之间的文本的信息，我编写了一个简单的函数，它获取总 string、左单词、右单词和 char 寻找。

public int CountCharactersBetweenWords(string totalString, string leftWord, string rightWord, char search)
{
    // Find the indexes of the end of the left and the start of the right word
    int pFrom = totalString.IndexOf(leftWord) + leftWord.Length;
    int pTo = totalString.LastIndexOf(rightWord);

    // Get the substring between the words
    string between = totalString.Substring(pFrom, pTo - pFrom);

    // Count the characters that are equal with the character to search for
    return between.Count(c => c == search);
}

这样称呼它：

string s = "DATE\t\t\tVERSION\t\tAUTHOR\t\t\t\t\tCOMMENTS";
int count = CountCharactersBetweenWords(s, "DATE", "VERSION", '\t');

Answer 3

按关键字拆分字符串然后计数。

 string s = "DATE\t\t\tVERSION\t\tAUTHOR\t\t\tCOMMENTS";
 string[] list = s.Split(new string[] { "DATE", "VERSION", "COMMENTS", "AUTHOR" }, StringSplitOptions.None);
 int TabsDateVersion = list[1].Count(x => x == '\t');     
 int TabsVersionAuthor = list[2].Count(x => x == '\t');
 int tabsAuthorComments = list[3].Count(x => x == '\t');

Answer 4

让我们试试单眼皮！使用正则表达式！

Regex.Match("DATE\t\t\tVERSION\t\tAUTHOR\t\t\t\t\tCOMMENTS", 
    "DATE(\t*)").Groups[1].Length

这里使用的正则表达式是

DATE(\t*)

它基本上是查找 "DATE" 并捕获其后的所有制表符并将它们全部放在组 1 中。您可以将 "DATE" 替换为 "VERSION"、"COMMENTS"等等

记得在 System.Text.RegularExpressions!

中添加 using 指令

计算字符串 C# 中单词之间的制表符

Count tabs between words in a string C#

c#

delimiter