Remove HTML tags in String [closed]

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How can I remove HTML tags from the following string?

<P style="MARGIN: 0cm 0cm 10pt" class=MsoNormal><SPAN style="LINE-HEIGHT: 115%; 
FONT-FAMILY: 'Verdana','sans-serif'; COLOR: #333333; FONT-SIZE: 9pt">In an 
email sent just three days before the Deepwater Horizon exploded, the onshore 
<SPAN style="mso-bidi-font-weight: bold"><b>BP</b></SPAN> manager in charge of 
the drilling rig warned his supervisor that last-minute procedural changes were 
creating "chaos". April emails were given to government investigators by <SPAN 
style="mso-bidi-font-weight: bold"><b>BP</b></SPAN> and reviewed by The Wall 
Street Journal and are the most direct evidence yet that workers on the rig 
were unhappy with the numerous changes, and had voiced their concerns to <SPAN 
style="mso-bidi-font-weight: bold"><b>BP</b></SPAN>’s operations managers in 
Houston. This raises further questions about whether <SPAN 
style="mso-bidi-font-weight: bold"><b>BP</b></SPAN> managers properly 
considered the consequences of changes they ord开发者_StackOverflow社区ered on the rig, an issue 
investigators say contributed to the disaster.</SPAN></p><br/>  

I'm writing it to Asponse.PDF, but the HTML tags are shown in the PDF. How can I remove them?

---

Warning: This does not work for all cases and should not be used to process untrusted user input.

using System.Text.RegularExpressions;
...
const string HTML_TAG_PATTERN = "<.*?>";

static string StripHTML (string inputString)
{
   return Regex.Replace 
     (inputString, HTML_TAG_PATTERN, string.Empty);
}

---

You should use the HTML Agility Pack:

HtmlDocument doc = ...
string text = doc.DocumentElement.InnerText;