javaregex

Java regular expression for multiple matchers

I'm trying to build a regular expression to return initial value and then all key value pairs.

Text is

abcd{123}hello world{456}asd * ~ . , 1243214 aadasd{678}asd aaasddd

Expected output is

    HEADER -> abcd
    123 -> hello world
    456 -> asd * ~ . , 1243214 aadasd
    678 -> asd aaasddd

Thanks in advance...

I tried with below regex but it does not provide correct results

(?:{\d{4}})([\w]+[\S]*[.,]*[\s]+)
Solution

  • You can use:

    ([^\\{\\r\\n]+)?\\{\\s*(\\d+)\\s*\\}([^\\{\\r\\n]+)

    Code:

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

public class Solution {
    public static void main(String[] args) {
        String s = "abcd{123}hello world{456}asd * ~ . , 1243214 aadasd{678}asd aaasddd";

        String p = "([^\\{\\r\\n]+)?\\{\\s*(\\d+)\\s*\\}([^\\{\\r\\n]+)";
        Pattern pattern = Pattern.compile(p);
        Matcher matcher = pattern.matcher(s);

        while (matcher.find()) {
            String header = matcher.group(1);
            String key = matcher.group(2);
            String value = matcher.group(3);

            if (header != null) {
                System.out.println("HEADER -> " + header);
            }
            System.out.println(key + " -> " + value.trim());
        }
    }
}

    Prints

    HEADER -> abcd
123 -> hello world
456 -> asd * ~ . , 1243214 aadasd
678 -> asd aaasddd

    Notes: