Parse a String to obtain id numbers

Question

My input String is as below,

{"string name"=hi;"id"=44401234;"string name"=hey;"id"=87695432.....}

I want only the ids as output like, {44401234 87695432}

        for(int i=0;i<input.length();i++)
          {
               int index=input.indexOf("id");
               hh=input.substring(index+4,index+12);
               System.out.println(hh);
          }

Splitting the `String` first with `;` and then with `=`, should help you do that easily. — Shashank Kadne, Oct 13 '13 at 05:43
actually the string i have put up is simpler the actual string is much complex and has all kinds of special charatcers in it — happs, Oct 13 '13 at 05:45
i only wanted to increment my string so that it gives new id values,it instead prints the same id everytime — happs, Oct 13 '13 at 05:46
This is because you are using `indexOf("id")`, this will always give you the first index of `id`. — Shashank Kadne, Oct 13 '13 at 05:47
@user2755930: Then provide a more realistic sample and your expected output. — anubhava, Oct 13 '13 at 05:48
possible duplicate of [How to parse JSON in Java](http://stackoverflow.com/questions/2591098/how-to-parse-json-in-java) — NoBugs, Oct 13 '13 at 05:49

score 0 · Accepted Answer · answered Oct 13 '13 at 05:53

0

The below code uses Regex to get the value associated with id

try

import java.util.regex.Matcher;
import java.util.regex.Pattern;

      public class Test {
            public static void main(String[] args) {
                String input = "{\"string name\"=hi;\"id\"=44401234;\"string name\"=hey;\"id\"=87695432.....}";
                Pattern pattern = Pattern.compile("\"id\"=[0-9]{8}");
                Matcher m = pattern.matcher(input);
                while (m.find()) {
                    String str = m.group();
                    str = str.replace("\"id\"=", "");
                    System.out.println(str);
                }
            }

        }

answered Oct 13 '13 at 05:53

upog

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what lib do i need to import for pattern and matcher – happs Oct 13 '13 at 05:56
updated the code, No external lib required – upog Oct 13 '13 at 05:58
Can his names have numbers in them? – Millie Smith Oct 13 '13 at 06:01
yes, The regex will match only the string that strats with "id"= and followed by 8 digit number – upog Oct 13 '13 at 06:03
my code terminates without printing any output – happs Oct 13 '13 at 06:09
the input string considered spans over 2 pages to parse can that be the reason? – happs Oct 13 '13 at 06:10

Parse a String to obtain id numbers

1 Answers1