How to Effectively Remove HTML Tags from Strings in ASP.NET?

Remove HTML tags from strings in ASP.NET

In ASP.NET, removing HTML tags from strings can be achieved through the following methods:

Regular expression replacement

Although the regular expression replacement method has some limitations, it can still reliably remove HTML tags from strings:

1. Find and replace "1*(>|$)".

2. Normalize the string, replacing "[srn]" with a single space.

3. Remove leading and trailing spaces from the result string.

Example:

Input = "

• Hello

" cleaned = Regex.Replace(input, "1*(>|$)").Normalize().Trim() Console.WriteLine(cleaned); // Output: "Hello"

Note: This method has limitations when encountering HTML/XML that contains ">" in the attribute value.

Use external libraries

Consider using a mature HTML parsing library, such as:

• HTMLAgilityPack
• HtmlSanitizer
• Purifier

These libraries provide comprehensive and customizable HTML parsing and sanitizing capabilities.

Example (using HTMLAgilityPack):

using HtmlAgilityPack; ... HtmlDocument doc = new HtmlDocument(); doc.LoadHtml(input); Console.WriteLine(doc.DocumentNode.InnerText); // Output: "Hello"

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