Mega Code Archive
Remove tags from a html string
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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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