getting character from string that is after specific chars (java)

Mehran :

I have a problem getting char from string. 6xˆ3 + 5 + 10xˆ2, I have this as string and want to get the number after x^. How can I do this without using if and for? Is there any method and regex that can help me?

Arvind Kumar Avinash :

Do it as follows:

import java.util.Arrays;
import java.util.regex.MatchResult;
import java.util.regex.Pattern;

public class Main {

    public static void main(String args[]) {
        String exp = "6x^3 + 5 + 10x^2";
        String[] nums = Pattern.compile("(?<=x\\^)[0-9]+").matcher(exp).results().map(MatchResult::group)
                .toArray(String[]::new);
        System.out.println(Arrays.toString(nums));
    }
}

Output:

[3, 2]

Note: Matcher::results is available only since Java 9.

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