C# 替换字符串的一部分 [英] C# Replace part of a string

问题描述

如何替换具有潜在未知起始索引的字符串的一部分.例如，如果我有以下字符串:

How can I replace part of a string that has a potentially unknown starting index. For instance, if I had the following strings:

"<sometexthere width='200'>"
"<sometexthere tile='test' width='345'>"

我希望替换可能具有未知值和未知起始索引之前提到的宽度属性值.

I would be looking to replace the width attibute value that can have an unknown value and as mentioned before an unknown start index.

我知道我必须以某种方式将此基于以下部分，这是不变的，我只是不太明白如何实现这一点.

The I understand that I would somehow have to base this on the following part, which is constant, I just don't quite understand how to achieve this.

width='

推荐答案

using System.Text.RegularExpressions;
Regex reg = new Regex(@"width='\d*'");
string newString = reg.Replace(oldString,"width='325'");

这将返回一个具有新宽度的新字符串，前提是您在新宽度字段中的 ' ' 之间放置了一个数字.

This will return a new string with a new width, provided you put a number between the ' ' in the new width field.

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