String.replaceAll的问题.

Question

String keywordPattern = "(?i)"+ keyword;
contentStr = contentStr.replaceAll(keywordPattern,"<font color='#FF0000'>"+ keyword +"</font>");在英语中有大小写,比如:"java","Java","JAVA","jAVA",我用(?i)来匹配的话,后面的加量该怎么写?即如何拿到匹配的引用?lucene的highlighten不行,因为分词的那个组件和highlight有兼容性问题;所以不考虑你推荐的highlighten了.谢谢!

Answer 1

String keywordPattern = "(?i)("+ keyword + ")";
contentStr = contentStr.replaceAll(keywordPattern,"<font color='#FF0000'>$1</font>");

Answer 2

好象不对,报错:
java.lang.IndexOutOfBoundsException: No group 2