如何在 C# 中使用 Regex.Replace 对组匹配值进行 UrlEncode

发布于 2024-10-18 05:50:05 字数 907 浏览 0 评论 0原文

我在 C# 代码中使用正则表达式，使用 Regex.Replace 匹配某些内容 url。我认为我的模式符合我需要的正确匹配方式。我使用“$1”组值语法来创建新字符串。问题是，我需要对“$1”提供的值进行 UrlEncode。我是否需要循环遍历匹配集合，或者我仍然可以使用 Regex.Replace 吗？感谢您的帮助。

Regex regex = new Regex(@"src=""(.+?/servlet/image.+?)""");

// value of $1 needs to be Url Encoded!
string replacement = @"src=""/relative/image.ashx?imageUrl=$1""";
string text1 = @"src=""http://www.domain1.com/servlet/image?id=abc""";
string text2 = @"src=""http://www2.domain2.com/servlet/image?id2=123""";
text1 = regex.Replace(text1, replacement);
/*
    text1 output:
    src="/relative/image.ashx?imageUrl=http://www.domain1.com/servlet/image?id=abc"
    imageUrl param above needs to be url encoded
*/

text2 = regex.Replace(text2, replacement);
/*
    text2 output:
    src="/relative/image.ashx?imageUrl=http://www2.domain2.com/servlet/image?id2=123"
    imageUrl param above needs to be url encoded
*/

原文

I am using a regular expression in my c# code that matches some content urls using Regex.Replace. I think I have the pattern the way I need it to match correctly. I am using the '$1' group value syntax to create the new string. The problem is, I need to UrlEncode the value provided by '$1'. Do I need to loop through the matches collection or can I still use Regex.Replace? Thanks for your help.

Regex regex = new Regex(@"src=""(.+?/servlet/image.+?)""");

// value of $1 needs to be Url Encoded!
string replacement = @"src=""/relative/image.ashx?imageUrl=$1""";
string text1 = @"src=""http://www.domain1.com/servlet/image?id=abc""";
string text2 = @"src=""http://www2.domain2.com/servlet/image?id2=123""";
text1 = regex.Replace(text1, replacement);
/*
    text1 output:
    src="/relative/image.ashx?imageUrl=http://www.domain1.com/servlet/image?id=abc"
    imageUrl param above needs to be url encoded
*/

text2 = regex.Replace(text2, replacement);
/*
    text2 output:
    src="/relative/image.ashx?imageUrl=http://www2.domain2.com/servlet/image?id2=123"
    imageUrl param above needs to be url encoded
*/

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流心雨 2024-10-25 05:50:05

Regex.Replace() 具有接受 MatchEvaluator 委托的重载。该委托接受 Match 对象并返回替换字符串。像这样的东西应该适合你想要的。

regex.Replace(text, delegate(Match match)
{
    return string.Format(@"src=""/relative/image.ashx?imageUrl={0}""", HttpUtility.UrlEncode(match.Groups[1].Value));
});

Regex.Replace() has an overload that takes in a MatchEvaluator delegate. This delegate takes in the Match object and returns the replacement string. Something like this should work for what you want.

regex.Replace(text, delegate(Match match)
{
    return string.Format(@"src=""/relative/image.ashx?imageUrl={0}""", HttpUtility.UrlEncode(match.Groups[1].Value));
});

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