code: static boolean validate(String value, List<JQLPlaceHolder> placeHolders, int pos) {
  		return placeHolders.get(pos).value.equals(value);
  	}
docs: look for variable name in place holders defined through path of content
  provider.
  
  @param value
  the value
  @param placeHolders
  the place holders
  @param pos
  the pos
  @return <code>true</code> if we found it path