remove only some html tags on c#

Question

I have a string:

string hmtl = "
 xpto 

and need to remove the tags of

Answer 1

Use Regex:

var result = Regex.Replace(html, @"", "");

UPDATED

as you mentioned, by this code, regex removes all tages else B

var hmtl = "
 xpto 
";
var remainTag = "B";
var pattern = String.Format("(]*(?)", remainTag );
var result =  Regex.Replace(hmtl , pattern, "");