removed comma from windows invalid path chars.

NzbDrone.Common/StringExtensions.cs

@@ -0,0 +1,39 @@
+using System.Text.RegularExpressions;
+using System.Linq;
+
+namespace NzbDrone.Common
+{
+    public static class StringExtensions
+    {
+        public static string Inject(this string format, params object[] formattingArgs)
+        {
+            return string.Format(format, formattingArgs);
+        }
+
+        public static string Inject(this string format, params string[] formattingArgs)
+        {
+            return string.Format(format, formattingArgs.Cast<object>());
+        }
+
+
+        private static readonly Regex InvalidCharRegex = new Regex(@"[^a-z0-9\s-]", RegexOptions.Compiled | RegexOptions.IgnoreCase);
+        private static readonly Regex CollapseSpace = new Regex(@"\s+", RegexOptions.Compiled | RegexOptions.IgnoreCase);
+
+        public static string ToSlug(this string phrase)
+        {
+            phrase = phrase.RemoveAccent().ToLower();
+
+            phrase = InvalidCharRegex.Replace(phrase, string.Empty);
+            phrase = CollapseSpace.Replace(phrase, " ").Trim();
+            phrase = phrase.Replace(" ", "-");
+
+            return phrase;
+        }
+
+        public static string RemoveAccent(this string txt)
+        {
+            var bytes = System.Text.Encoding.GetEncoding("Cyrillic").GetBytes(txt);
+            return System.Text.Encoding.ASCII.GetString(bytes);
+        }
+    }
+}