Question

I would like to split this string by a word “data::” not by single character. How?

String bla = "data::01000100010001000100data::0101001010101010101data::11111111111111111";
String result[] = bla.split("\\data::");
/*
 * this outputs the whole string
 * instead of only: 01000100010001000100*/
System.out.println(result[0]); 

Note:

    package test;        
    public class NewClass 
    {    
        public static void main(String[] args) 
        {     
          String bla = "data::0000data::1111data::010101";

          // Try 1 - failed
          String[] parta = bla.split("\\ddata::");
          System.out.println(parta[0]);        
          System.out.println(parta[1]);        
          System.out.println(parta[2]);        

          // Try 2 - failed -- works
          String[] partb = bla.split("data::");
          System.out.println(partb[0]); // consider as empty
          System.out.println(partb[1]); // starts from here
          System.out.println(partb[2]); 

          // Try 3 - failed
          String partc[] = bla.split("\\wdata::");
          System.out.println(partc[0]);        
          System.out.println(partc[1]);        
          System.out.println(partc[2]);                            
        }
    }

Failed Output:

run:
data::000
111
010101

0000
1111

data::000
111
010101

BUILD SUCCESSFUL (total time: 0 seconds)

Answer 1

\\d inside a string literal denotes a digit in regex. You need to split on simply this:

bla.split("data::")

Because there is no single digit followed by ata:: (the pattern: "\\data::"), the entire string is returned by String.split(...).