多次匹配optionalGroup

`
else {
                //Matches
                matchList.add(new MatchInfo(e, ""));
                matchList.addAll(this.getMatchingExpansions(og.getChildExpansion(), words, wordPosition));
            }
`
需要改成
`
else {
                //Matches
                matchList.add(new MatchInfo(e, ""));
                matchList.addAll(m1);
            }
`
否则会有意想不到的错误