Remove tags from a html string : HTML « Network « C# / C Sharp

1. C# / C Sharp
2. Network
3. HTML

Remove tags from a html string

 

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Text.RegularExpressions;
using System.ComponentModel;

namespace NearForums
{
  public static class Utils
  {
    public static bool IsHtmlFragment(string value)
    {
      return Regex.IsMatch(value, @"</?(p|div)>");
    }

    /// <summary>
    /// Remove tags from a html string
    /// </summary>
    /// <param name="value"></param>
    /// <returns></returns>
    public static string RemoveTags(string value)
    {
      if (value != null)
      {
        value = CleanHtmlComments(value);
        value = CleanHtmlBehaviour(value);
        value = Regex.Replace(value, @"</[^>]+?>", " ");
        value = Regex.Replace(value, @"<[^>]+?>", "");
        value = value.Trim();
      }
      return value;
    }

    /// <summary>
    /// Clean script and styles html tags and content
    /// </summary>
    /// <returns></returns>
    public static string CleanHtmlBehaviour(string value)
    {
      value = Regex.Replace(value, "(<style.+?</style>)|(<script.+?</script>)", "", RegexOptions.IgnoreCase | RegexOptions.Singleline);

      return value;
    }

    /// <summary>
    /// Replace the html commens (also html ifs of msword).
    /// </summary>
    public static string CleanHtmlComments(string value)
    {
      //Remove disallowed html tags.
      value = Regex.Replace(value, "<!--.+?-->", "", RegexOptions.IgnoreCase | RegexOptions.Singleline);

      return value;
    }

    /// <summary>
    /// Adds rel=nofollow to html anchors
    /// </summary>
    public static string HtmlLinkAddNoFollow(string value)
    {
      return Regex.Replace(value, "<a[^>]+href=\"?'?(?!#[\\w-]+)([^'\">]+)\"?'?[^>]*>(.*?)</a>", "<a href=\"$1\" rel=\"nofollow\" target=\"_blank\">$2</a>", RegexOptions.IgnoreCase | RegexOptions.Compiled);
    }
  }
}

   
  

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