c sharp中的文本比较 [英] Text Comparison in c sharp

问题描述

我写了一个程序来突出显示单词列表中的文本。例如男孩是好人，如果我想使用indexOf突出显示男孩，它将突出显示。现在的问题是像男孩是个好孩子这样的陈述，如果我想突出第二个男孩，我不知道如何，因为它只有第一个男孩仍然会突出显示。请帮助，因为我仍然是一些新的c sharp。

I wrote a program to highlight a text in a list of words. For example "The boy is a good", if i want to highlight "boy" using indexOf, it will be highlighted. now the problem is for a statement like "The boy is a good boy", if i want to highlight the second boy, i dont know how, because its only the first boy that will still be highlighted. Pls help as am still some how new to c sharp.

推荐答案

两个选项：



使用 String.IndexOf ：

Two options:

using String.IndexOf:

int SecondIndexOf(string theString, string toFind)
{
    int first = theString.IndexOf(toFind);

    if (first == -1) return -1;

    // Find the "next" occurrence by starting just past the first
    return theString.IndexOf(toFind, first + 1);
}

使用正则表达式：

Using Regex:

public static int NthIndexOf(this string target, string value, int n)
    {
        Match m = Regex.Match(target, "((" + value + ").*?){" + n + "}");

        if (m.Success)
            return m.Groups[2].Captures[n - 1].Index;
        else
            return -1;
    }

干杯，

Edo

Cheers,
Edo

首先，你必须检查条件，当它找到然后给它的索引时，该行中有多少次......

First You Have To Check Condition That How Many Times That Word Is In That Row When Its Find Then Give Index Of It....

也许这可能有所帮助。此函数定位您要查找的所有文本：

Perhaps this could help. This function locates all the occurrences of the text you're looking for:

private List<Match> FindOccurrences( string SourceText, string Expression )
{
    List<Match> Result = new List<Match>();

    Regex Parser = new Regex( Expression, RegexOptions.Compiled );

    Match Match = Parser.Match( SourceText );

    while (Match.Success)
    {
        Result.Add( Match );
        Match = Match.NextMatch();
    }

    return Result;
}

你可以像这样调用这个函数：

You can call the function simply like this:

List<Match> Matches = FindOccurrences( "This contains boy here and again contains boy here", "boy" );

物业 类型对象的索引匹配包含输入字符串中的位置。

The property Index of the objects of type Match contains the position into the input string.

这篇关于c sharp中的文本比较的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！