Method startAlternative

classpath/java/util/regex/Compiler.java:235–241

()

    }

    public void startAlternative() {
      if (alternatives == null) {
        alternatives = new ArrayList<Group>();
      }
      alternatives.add(new Group(false, list));
      list.clear();
    }

    public Expression pop() {
      Expression result = list.remove(list.size() - 1);