fixes #538 - Support additional artist splitting

MediaBrowser.Common/Extensions/BaseExtensions.cs

@@ -20,9 +20,40 @@ namespace MediaBrowser.Common.Extensions
         {
             // http://stackoverflow.com/questions/1349023/how-can-i-strip-html-from-text-in-net
             const string pattern = @"<(.|\n)*?>";
+
             return Regex.Replace(htmlString, pattern, string.Empty).Trim();
         }
 
+        /// <summary>
+        /// Replaces the specified STR.
+        /// </summary>
+        /// <param name="str">The STR.</param>
+        /// <param name="oldValue">The old value.</param>
+        /// <param name="newValue">The new value.</param>
+        /// <param name="comparison">The comparison.</param>
+        /// <returns>System.String.</returns>
+        public static string Replace(this string str, string oldValue, string newValue, StringComparison comparison)
+        {
+            var sb = new StringBuilder();
+
+            var previousIndex = 0;
+            var index = str.IndexOf(oldValue, comparison);
+
+            while (index != -1)
+            {
+                sb.Append(str.Substring(previousIndex, index - previousIndex));
+                sb.Append(newValue);
+                index += oldValue.Length;
+
+                previousIndex = index;
+                index = str.IndexOf(oldValue, index, comparison);
+            }
+
+            sb.Append(str.Substring(previousIndex));
+
+            return sb.ToString();
+        }
+
         /// <summary>
         /// Gets the M d5.
         /// </summary>