replaceAll 大小写敏感

public class Test{
	public static void main(String[] args){
		  replaceString("abcABC", "b", "c");
	}
	public static void replaceString(String a,String b,String c){
        System.out.println(a);
        String result = a.replaceAll("(?i)"+b, c); //大小写不敏感

        System.out.println(result);
        System.out.println(a.replaceAll(b, c));//大小写敏感

	  } 
}