String.replaceAll的有关问题

String.replaceAll的问题.

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!

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