Question

我正在尝试为文章创建一个基于正则表达式的替换，以自动将帖子中的嵌入引用（其中许多）转换为适当的链接和标题格式。

例如，鉴于此：

I have already blogged about this topic ((MY TOPIC ID: "2324" "a number of times")) before.   And I have also covered ((MY TOPIC ID: "777" "similar topics")) in the past.

......我想得到这个：

I have already blogged about this topic <a href='/post/2324'>a number of times</a> before.   And I have also covered <a href='/post/777'>similar topics</a> in the past.

我目前有这个：

/* Does not work */
public static string ReplaceArticleTextWithProductLinks(string input)
{
    string pattern = "\\(\\(MY TOPIC ID: \\\".*?\\\" \\\".*?\\\"\\)\\)";
    string replacement = "<a href='/post/$1'>$2</a>";

    return Regex.Replace(input, pattern, replacement);
}

但似乎返回包含<a href='/post/'></a>的行而不附加匹配而不是$ 1和$ 2.

问题：将上面的字符串＃1转换为字符串＃2的最简单方法是什么？

Answer 1

您没有捕获要提取的表达式的部分。尝试这样的事情：

public static string ReplaceArticleTextWithProductLinks(string input)
{
    string pattern = @"\(\(MY TOPIC ID: ""(.*?)"" ""(.*?)""\)\)";
    string replacement = "<a href='/post/$1'>$2</a>";

    return Regex.Replace(input, pattern, replacement);
}

C＃中的多个正则表达式替换

1 个答案: