Remove redundant escapes.

Author: marchermans

src/main/java/cpw/mods/niofs/layzip/LayeredZipFileSystemProvider.java

@@ -19,7 +19,7 @@ public class LayeredZipFileSystemProvider extends PathFileSystemProvider
     public static final String INDICATOR = "!";
     public static final String SEPARATOR =  INDICATOR + "/";
 
-    public static final String URI_SPLIT_REGEX = "((?<=(\\.zip)(?!(\\!))\\/)|(?<=(\\.jar)(?!(\\!))\\/)|\\!\\/)";
+    public static final String URI_SPLIT_REGEX = "((?<=(\\.zip)(?!(!))/)|(?<=(\\.jar)(?!(!))/)|!/)";
 
 
     @Override