Make material name parsing more lax

Author: Exter-N

src/Lumina/Models/Materials/Material.cs

@@ -174,7 +174,7 @@ public Material Update( GameData data )
             };
         }
 
-        [GeneratedRegex(@"/mt_(?'id1'[cdmw])(?'val1'\d{4})(?'id2'[abefhtze])(?'val2'\d{4})_(?:\w{3}(?:_\w)|(?:\w))\.mtrl")]
+        [GeneratedRegex(@"/mt_(?'id1'[cdmw])(?'val1'\d{4})(?'id2'[abefhtze])(?'val2'\d{4})_(?:\w|_)+\.mtrl")]
         private static partial Regex MatNameRegex();
 
 
@@ -242,4 +242,4 @@ private void ReadStrings()
             br.Dispose();
         }
     }
-}
+}