From d34286bf5d78a4ce7798887d8816043cbf8fcc63 Mon Sep 17 00:00:00 2001
From: niksedk <nikse.dk@gmail.com>
Date: Thu, 27 Aug 2015 16:38:58 +0200
Subject: [PATCH] Performance improvement in HtmlUtil

---
 libse/HtmlUtil.cs | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/libse/HtmlUtil.cs b/libse/HtmlUtil.cs
index 2542a5bd6..d585e177d 100644
--- a/libse/HtmlUtil.cs
+++ b/libse/HtmlUtil.cs
@@ -399,12 +399,13 @@ namespace Nikse.SubtitleEdit.Core
             return IsUrl(arr[0]);
         }
 
+        private static readonly string[] UppercaseTags = { "<I>", "<U>", "<B>", "<FONT", "</I>", "</U>", "</B>", "</FONT>" };
+
         public static string FixUpperTags(string text)
         {
             if (string.IsNullOrEmpty(text))
                 return text;
-            var tags = new string[] { "<I>", "<U>", "<B>", "<FONT", "</I>", "</U>", "</B>", "</FONT>" };
-            var idx = text.IndexOfAny(tags, StringComparison.Ordinal);
+            var idx = text.IndexOfAny(UppercaseTags, StringComparison.Ordinal);
             while (idx >= 0)
             {
                 var endIdx = text.IndexOf('>', idx + 2);
@@ -412,7 +413,7 @@ namespace Nikse.SubtitleEdit.Core
                     break;
                 var tag = text.Substring(idx, endIdx - idx).ToLowerInvariant();
                 text = text.Remove(idx, endIdx - idx).Insert(idx, tag);
-                idx = text.IndexOfAny(tags, StringComparison.Ordinal);
+                idx = text.IndexOfAny(UppercaseTags, StringComparison.Ordinal);
             }
             return text;
         }