private boolean nextValueIs(String input, int pos, String value) {
      return (input.length() >= (pos + value.length())) && (input.substring(pos, pos + value.length()).equalsIgnoreCase(value));
    }
convert in-fix expression to post-fix.

@param tokenizer tokenizer.
@return post-fix expression.
olv-core/src/main/java/pl/otros/logview/accept/query/org/apache/log4j/rule/InFixToPostFix.java