Question

I have a String which has numbers and I want to add this sign “:” between every two numbers as if the string was 0123456789 I want it to be like this 01:23:45:67:89

Is there any way to insert it ?? as I read about replace() but this does not help in my case

Answer 1

You could use this magic piece of regex:

System.out.println("0123456789".replaceAll(".{2}(?!$)", "$0:"));

• .{2} match 2 characters
• (?!$) not at end
• $0: First matched argument with : included