Ensure that all ssa tags are wiped out of srt subtitles

MediaBrowser.MediaEncoding/Subtitles/SrtParser.cs

@@ -69,7 +69,7 @@ namespace MediaBrowser.MediaEncoding.Subtitles
                     }
                     subEvent.Text = string.Join(ParserValues.NewLine, multiline);
                     subEvent.Text = subEvent.Text.Replace(@"\N", ParserValues.NewLine, StringComparison.OrdinalIgnoreCase);
-                    subEvent.Text = Regex.Replace(subEvent.Text, @"\{(\\[\w]+\(?([\w\d]+,?)+\)?)+\}", string.Empty, RegexOptions.IgnoreCase);
+                    subEvent.Text = Regex.Replace(subEvent.Text, @"\{(?:\\\d?[\w.-]+(?:\([^\)]*\)|&H?[0-9A-Fa-f]+&|))+\}", string.Empty, RegexOptions.IgnoreCase);
                     subEvent.Text = Regex.Replace(subEvent.Text, "<", "&lt;", RegexOptions.IgnoreCase);
                     subEvent.Text = Regex.Replace(subEvent.Text, ">", "&gt;", RegexOptions.IgnoreCase);
                     subEvent.Text = Regex.Replace(subEvent.Text, "&lt;(\\/?(font|b|u|i|s))((\\s+(\\w|\\w[\\w\\-]*\\w)(\\s*=\\s*(?:\\\".*?\\\"|'.*?'|[^'\\\">\\s]+))?)+\\s*|\\s*)(\\/?)&gt;", "<$1$3$7>", RegexOptions.IgnoreCase);

MediaBrowser.Tests/MediaEncoding/Subtitles/TestSubtitles/unit.srt

@@ -35,7 +35,7 @@ Unclosed but <b>supported HTML tags are left in, {\i1} SSA italics aren't
 
 9
 00:00:36,000 --> 00:00:36,999
-Multiple {\pos(142,120)\b1}SSA tags are stripped
+Multiple {\bord-3.7\clip(1,m 50 0 b 100 0 100 100 50 100 b 0 100 0 0 50 0)\pos(142,120)\t(0,500,\fscx100\fscy100)\b1\c&H000000&}SSA tags are stripped
 
 10
 00:00:37,000 --> 00:00:37,999