如何删除超过一些出现次数的重复br标签？(How to remove duplicate br tag that exceeds a number of occurences?)

我想为每个段落保留不超过2个

string html = @"paragraph 1 a dkahdk ahkdhadk. paragraph 2 adshkad hkasdhkasdh. paragraph 3 akdash dkjahiewry iwery. paragraph 4 ljsdlfjsldfj. "; HtmlAgilityPack.HtmlDocument doc = new HtmlDocument(); doc.LoadHtml(html); var xpath = "//text()[not(normalize-space())]"; var emptyNodes = doc.DocumentNode.SelectNodes(xpath); foreach (HtmlNode emptyNode in emptyNodes) { emptyNode.Remove(); // remove \r\n } var nodes = doc.DocumentNode.SelectNodes("//br[following-sibling::br[3]]").ToList(); foreach (var node in nodes) { node.Remove(); }

输出以某种方式删除所有br 。正确的输出应该是

paragraph 1 a dkahdk ahkdhadk. paragraph 2 adshkad hkasdhkasdh. paragraph 3 akdash dkjahiewry iwery. paragraph 4 ljsdlfjsldfj.

I want to keep no more than 2 for each paragraph

string html = @"paragraph 1 a dkahdk ahkdhadk. paragraph 2 adshkad hkasdhkasdh. paragraph 3 akdash dkjahiewry iwery. paragraph 4 ljsdlfjsldfj. "; HtmlAgilityPack.HtmlDocument doc = new HtmlDocument(); doc.LoadHtml(html); var xpath = "//text()[not(normalize-space())]"; var emptyNodes = doc.DocumentNode.SelectNodes(xpath); foreach (HtmlNode emptyNode in emptyNodes) { emptyNode.Remove(); // remove \r\n } var nodes = doc.DocumentNode.SelectNodes("//br[following-sibling::br[3]]").ToList(); foreach (var node in nodes) { node.Remove(); }

The output is somehow it removes all br. The right output should be

paragraph 1 a dkahdk ahkdhadk. paragraph 2 adshkad hkasdhkasdh. paragraph 3 akdash dkjahiewry iwery. paragraph 4 ljsdlfjsldfj.

最满意答案

与使用HtmlAgilityPack相比，简单的正则表达式替换就足够了。例如，使用多步骤过程：

//use regex to find , or tags: //var toNewLines = new Regex( @"<br\s?/?>" ); //var onlyNewLines = toNewLines.Replace(html, Environment.NewLine); //or, since all br tags are : var onlyNewLines = html.Replace(" ", Environment.NewLine); var regex = new Regex( @"([" + Environment.NewLine + "\t])+" ); var result = regex.Replace(onlyNewLines, Environment.NewLine); var finalResult = result.Replace(Environment.NewLine, " " + Environment.NewLine);

A simple regex replace would suffice, as opposed to using HtmlAgilityPack. For example, using a multi-step process:

//use regex to find , or tags: //var toNewLines = new Regex( @"<br\s?/?>" ); //var onlyNewLines = toNewLines.Replace(html, Environment.NewLine); //or, since all br tags are : var onlyNewLines = html.Replace(" ", Environment.NewLine); var regex = new Regex( @"([" + Environment.NewLine + "\t])+" ); var result = regex.Replace(onlyNewLines, Environment.NewLine); var finalResult = result.Replace(Environment.NewLine, " " + Environment.NewLine);

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