i use this method to convert html to plaint text but it have some bugs in this html tags <H1,2,3,..>
Method:
public string HtmlToPlainText(string htmlText)
{
//const string tagWhiteSpace = @"(>|$)(\W|\n|\r)+<";//matches one or more (white space or line breaks) between '>' and '<'
const string stripFormatting = @"<[^>]*(>|$)";//match any character between '<' and '>', even when end tag is missing
const string lineBreak = @"<(br|BR)\s{0,1}\/{0,1}>";//matches: <br>,<br/>,<br />,<BR>,<BR/>,<BR />
var lineBreakRegex = new Regex(lineBreak, RegexOptions.Multiline);
var stripFormattingRegex = new Regex(stripFormatting, RegexOptions.Multiline);
//var tagWhiteSpaceRegex = new Regex(tagWhiteSpace, RegexOptions.Multiline);
var text = htmlText;
//Decode html specific characters
text = System.Net.WebUtility.HtmlDecode(text);
//Remove tag whitespace / line breaks
//text = tagWhiteSpaceRegex.Replace(text, "><");
//Replace < br /> with line breaks
text = lineBreakRegex.Replace(text, Environment.NewLine);
//Strip formatting
text = stripFormattingRegex.Replace(text, string.Empty);
return text;
}
this is my html text :
<h3> This is a simple title </h3> </br> <p>Lorem ipsum <b> dolor sit </b> amet consectetur, <i>adipisicing elit.</i> </p>
This is my result :
This is a simple title Lorem ipsum dolor sit amet consectetur,
adipisicing elit.The result should be :
This is a simple title
Lorem ipsum dolor sit amet consectetur, adipisicing elit.
I think the error is from Strip formatting. How can i solve it?
Parsing HTML is not an easy task (even for a subset of HTML). If regex feels like a good solution for this task it is actually not that great. To parse HTML, you should use... an HTML parser. In C#, AngleSharp
and the HTMLAgilityPack
are the most common solution. Here is an example with AngleSharp:
using System;
using AngleSharp;
using AngleSharp.Html.Parser;
class MyClass {
static void Main() {
//Use the default configuration for AngleSharp
var config = Configuration.Default;
//Create a new context for evaluating webpages with the given config
var context = BrowsingContext.New(config);
//Source to be parsed
var source = @"<h3> This is a simple title </h3>
</br>
<p>Lorem ipsum <b> dolor sit </b> amet consectetur, <i>adipisicing elit.</i> </p>
";
//Create a parser to specify the document to load (here from our fixed string)
var parser = context.GetService<IHtmlParser>();
var document = parser.ParseDocument(source);
//Do something with document like the following
Console.WriteLine(document.DocumentElement.TextContent);
}
}
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