A: 

i dont know whether you are using ASP.net C# or not but if yes then first import

using System.Text.RegularExpressions;
using FredCK.FCKeditorV2;

these two things and then where you are retrieving your value from fckeditor then use

string fckContent = Regex.Replace(FCKEditorID.value, @"<(.|\n)*?>", string.Empty);
Mac