c# - 替换 标签之间的换行符

Question

我正在寻找替换/删除给定字符串中的所有换行符，但嵌套在 <pre> 中的换行符除外。标签。所以对于以下字符串:

var text = @"
    Some contents which is formatted
    over multiple
    lines but contains a 
    <pre>
        tag which has
        also has
        multiple line breaks.
    </pre>
";

我想删除所有换行符，除了嵌套在 pre 标记中的换行符:

Regex.Replace(text, "\n", "<br />");

Answer 1

使用负面展望，您仍然可以在一行中完成:

text = Regex.Replace(text, "\n(?![^<]*</pre>)", "<br />");

这是一些测试代码，更好的示例包含多个 <pre>标签:

var text = @"
    Some contents which is formatted
    over multiple
    lines but contains a 
    <pre>
        tag which has
        also has
        multiple line breaks.
    </pre>
    foo 1
    bar 1
    <pre>
        tag which has
        also has
        multiple line breaks.
    </pre>
    foo 2
    bar 2
";
text = Regex.Replace(text, "\n(?![^<]*</pre>)", "<br />");
Console.WriteLine(text);

输出:

<br />    Some contents which is formatted<br />    over multiple<br />    lines but contains a <br />    <pre>
    tag which has
    also has
    multiple line breaks.
</pre><br />    foo 1<br />    bar 1<br />    <pre>
    tag which has
    also has
    multiple line breaks.
</pre><br />    foo 2<br />    bar 2<br />