不区分大小写高亮显示关键字字符串

//支持高亮显示大小写
String titlebig=title.toUpperCase();
String keywordbig=keyword.toUpperCase();
int start=titlebig.indexOf(keywordbig);
int end=keywordbig.length()+start;
title=(title.substring(0,start)+"<font color=red>"+title.substring(start,end)+"</font>"+title.substring(end));