Regular Expressions with Pattern

Regular Expressions with Pattern

Save as Main.java and run with a Java 17+ JDK: java Main.java.

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

public class Main {
  public static void main(String[] args) throws Exception {
    Pattern pattern = Pattern.compile("([A-Z]+)-([0-9]{3})");
    Matcher match = pattern.matcher("TASK-042");
    if (match.matches()) {
      System.out.println(match.group(1));
      System.out.println(Integer.parseInt(match.group(2)));
    }
    System.out.println(pattern.matcher("TASK-042-extra").matches());
  }
}

1. Expected output: TASK 42 false
2. Capture groups are available after a successful match. The final input is rejected because it has trailing characters.