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Код

public class Test {
    private static final String STRING = "Привет пока Hello hell"; 
    public static void main(String[] args){
        System.out.println(STRING);
        System.out.println();
        test1("(?s)[пh]");
        test1("(?i)[пh]");
        System.out.println();
        test2("(?s)[пh]");
        test2("(?i)[пh]");
        System.out.println();
        test3("(?s)[пh]");
        test3("(?i)[пh]");
        System.out.println();
        test4("(?s)[пh]");
        test4("(?i)[пh]");

    }
    
    public static void test1(String regexp){
        Matcher matcher = Pattern.compile(regexp,Pattern.UNICODE_CASE )
                .matcher(STRING);
        System.out.println(matcher.replaceAll("#"));
    }
    
    public static void test2(String regexp){
        Matcher matcher = Pattern.compile(regexp)
                .matcher(STRING);
        System.out.println(matcher.replaceAll("#"));
    }
    
    public static void test3(String regexp){
        Matcher matcher = Pattern.compile(regexp,Pattern.CASE_INSENSITIVE|Pattern.UNICODE_CASE )
                .matcher(STRING);
        System.out.println(matcher.replaceAll("#"));
    }
    
    public static void test4(String regexp){
        Matcher matcher = Pattern.compile(regexp,Pattern.CASE_INSENSITIVE )
                .matcher(STRING);
        System.out.println(matcher.replaceAll("#"));
    }
}