code: private String getVariantKey(String contextPath) {
  
  		// Remove first slash
  		String resultPath = contextPath.substring(1);
  		String variantKey = "";
  		// eval the existence of a suffix
  		String prefix = resultPath.substring(0, resultPath.indexOf(JawrConstant.URL_SEPARATOR));
  
  		// The prefix also contains variant information after a '.'
  		if (prefix.indexOf('.') != -1) {
  			variantKey = prefix.substring(prefix.indexOf('.') + 1);
  		}
  
  		return variantKey.trim();
  	}
docs: Returns the variant key from the context path.
  
  @param contextPath
  the path
  @return the variant key