[banshee] [CoverArtSpec] Compile the regex used in EscapePart

[Bertrand Lorentz <blorentz src gnome org>]

commit e34defb97ea01f64d799bfe4d827ab324063de0b
Author: Bertrand Lorentz <bertrand lorentz gmail com>
Date:   Sat Jun 20 11:34:11 2009 +0200

    [CoverArtSpec] Compile the regex used in EscapePart
    
    Saves some memory allocation and cpu on track change.

 src/Core/Banshee.Core/Banshee.Base/CoverArtSpec.cs |    6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)
---
diff --git a/src/Core/Banshee.Core/Banshee.Base/CoverArtSpec.cs b/src/Core/Banshee.Core/Banshee.Base/CoverArtSpec.cs
index 0f065a6..5d09b82 100644
--- a/src/Core/Banshee.Core/Banshee.Base/CoverArtSpec.cs
+++ b/src/Core/Banshee.Core/Banshee.Base/CoverArtSpec.cs
@@ -86,7 +86,8 @@ namespace Banshee.Base
                 ? null 
                 : String.Format ("{0}{1}{2}", sm_artist, asUriPart ? "/" : "-", sm_album); 
         }
-        
+
+        private static Regex filter_regex = new Regex (@"[^A-Za-z0-9]*", RegexOptions.Compiled);
         public static string EscapePart (string part)
         {
             if (String.IsNullOrEmpty (part)) {
@@ -98,8 +99,7 @@ namespace Banshee.Base
                 part = part.Substring (0, lp_index);
             }
             
-            // TODO compile regex
-            return Regex.Replace (part, @"[^A-Za-z0-9]*", "").ToLower ();
+            return filter_regex.Replace (part, "").ToLower ();
         }
         
         private static string root_path = Path.Combine (XdgBaseDirectorySpec.GetUserDirectory (