Hi,

I have string

String s = "Hello \"World\"";

when i print this on console, it prints

Hello "World"

It works fine. Now what i want to is to print

Hello \"World\"

Which means i have to replace the quotes (") with (\\) and then a
quote so that i may get a quote in output. so i used replaceAll method

System.out.println(s.replaceAll("\"", "\\\""));

But to my astonish, it prints out

Hello "World".

I wondered and then tried to do it again with

System.out.println(s.replaceAll("\"", "\\\\\""));

Now i was able to see the desired outout i.e; Hello \"World\"

But why i have to use 5 back slashes instead of 3 which were according
to the logic of "backsequences"?? I have seen the replaceAll method
and it is using the pattern matching in it.

If i try to replace the string using simple "replace" method it works
fine; i.e i don't have to use 5 backslashes, i use only 3 (according
to logic). Can someone explain why i have to use 5 slasheds in
replaceAll.