取消C＃.NET中使用正则表达式的一段文字 [英] Remove a piece of text using Regex in C# .NET

问题描述

我不知道正恩pressions，并且只有一个小任务，我不想坐下来，学习他们 - 更不用提他们似乎很复杂。我想要做的事情是一款传递给方法，并删除与参数，将启动开始，并与参数结束结尾的一段文字。

 公共静态字符串RemoveBetween（字符串wholeText，字符串开始，字符串结尾）
    {

    }
 

例如：

 字符串MyString的=一二三四五;
MyString的= RemoveBetween（MyString的，二，四）;
 

最后一个字符串将是一五

解决方案

 公共静态字符串RemoveBetween（字符串wholeText，字符串开始，字符串结尾）
{
    Regex.Replace（wholeText，的String.Format（{0} * {1}？，Regex.Escape（开始），Regex.Escape（结束））的String.Empty）;
}
 

容易。严重的是，学会定期EX pressions;他们采取了一大堆的解析，并减少了code一行。

作为对比，这里的东西逼近你必须做没有一个正则表达式是什么：

 公共静态字符串RemoveBetween（字符串wholeText，字符串开始，字符串结尾）
{
    VAR的结果= wholeString;
    VAR的startIndex = result.IndexOf（开始）;
    而（在startIndex＆GT; = 0）
    {
        VAR endIndex的= result.IndexOf（完）+ end.Length;
        // TODO：定义行为时，结束串不出现或者是开始字符串之前的
        结果= result.Substring（0，在startIndex）+ result.Substring（endIndex的+ 1，result.Length  -  endIndex的）;
        在startIndex = result.IndexOf（开始）;
    }
    返回结果;
}
 

I don't know regular expressions, and for only a small task, I don't want to sit and learn them - not to mention they seem very complicated. The thing I want to do is to pass a paragraph to a method and remove a piece of text that starts with parameter "begin" and ends with parameter "end".

    public static string RemoveBetween(string wholeText, string begin, string end) 
    { 

    } 

Ex:

string myString = "one two three four five";
myString = RemoveBetween(myString, "two", "four");

The final string would be "one five"

解决方案

public static string RemoveBetween(string wholeText, string begin, string end) 
{ 
    Regex.Replace(wholeText, String.Format("{0}.*?{1}", Regex.Escape(begin), Regex.Escape(end)), String.Empty);
}

Easy. Seriously, learn regular expressions; they take a whole lot of parsing and reduce it to a single line of code.

As a comparison, here's something approximating what you'd have to do without a Regex:

public static string RemoveBetween(string wholeText, string begin, string end) 
{ 
    var result = wholeString;
    var startIndex = result.IndexOf(begin);
    while(startIndex >=0)
    {
        var endIndex = result.IndexOf(end) + end.Length;
        //TODO: Define behavior for when the end string doesn't appear or is before the begin string
        result = result.Substring(0,startIndex) + result.Substring(endIndex+1, result.Length - endIndex);
        startIndex = result.IndexOf(begin);
    }
    return result;
}

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