Splitting a String in Java with underscore as delimiter

Question

I have the following String (This format for the string is generic)

abc_2012-10-18-05-37-23_prasad_hv_Complete

I want to extract only

Answer 1

You can use a regex to extract the data:

String input = "abc_2012-10-18-05-37-23_prasad_hv_Complete";
String output = input.replaceAll("(?i)^[a-z]+_[^_]+_(\\w+)_[a-z]+$", "$1");

Answer 2

You say

This format for the string is generic.

Then concatenate the elements with indexes 2 and 3 after splitting:

String str = "abc_2012-10-18-05-37-23_prasad_hv_Complete";
String[] parts = str.split("_");
String extractedResult = "";
if(parts.length > 3)
   extractedResult = parts[2] + "_" + parts[3]; // prasad_hv is captured here.

Answer 3

May be you can try appending the strings again if you exactly know the location of them and if you are sure that locations are constant.

Answer 4

This will work even when you have many number of underscore characters in the string you wanted.

str.substring(str.indexOf("_", str.indexOf("_") + 1) + 1, str.lastIndexOf("_"));

Answer 5

What I understand by your question is that you want 3rd element to (n-1)th element of the String split by "_" to come as it is (where n is the length of array formed after splitting). So, the code would be like this:

import java.util.Arrays;

public class StringSplit {
    public static final String test = "abc_2012-10-18-05-37-23_prasad_hv_Complete";
    public static void main(String args[]){
        String[] data = test.split("_");
        System.out.println(Arrays.toString(data));
        String aim = data[2];
        for(int i=3;i<data.length-1;i++){
            aim+="_"+data[i];
        }
        System.out.println(aim);
    }
}

Answer 6

You can do like this

String token[] = myString().split("_");
String resultString = "";

for(int a=0; a<token.length-1 ;a++){

   if(a == token.length-2)
   resultString = resultString+token[a]
   else
   resultString = resultString+token[a]+"_";


}

the resultString would be your desired string in every case