Validate an immutable record in its constructor

import java.util.Objects;
import java.util.regex.Pattern;

/** Validated signup payload; invalid values fail fast at construction. */
public record SignupRequest(String email, String displayName, int age) {

    private static final Pattern EMAIL =
            Pattern.compile("^[^@\\s]+@[^@\\s]+\\.[^@\\s]+$");

    // Compact constructor validates and normalises every component.
    public SignupRequest {
        Objects.requireNonNull(email, "email");
        email = email.trim().toLowerCase();
        if (!EMAIL.matcher(email).matches()) {
            throw new IllegalArgumentException("invalid email: " + email);
        }
        displayName = Objects.requireNonNull(displayName, "displayName").trim();
        if (displayName.isEmpty() || displayName.length() > 80) {
            throw new IllegalArgumentException("displayName must be 1..80 chars");
        }
        if (age < 13 || age > 130) {
            throw new IllegalArgumentException("age out of range: " + age);
        }
    }

    public static void main(String[] args) {
        SignupRequest ok = new SignupRequest(" [email protected] ", "Ada", 36);
        System.out.println(ok.email() + " / " + ok.displayName());

        try {
            new SignupRequest("not-an-email", "Ada", 36);
        } catch (IllegalArgumentException e) {
            System.out.println(e.getMessage());
        }
    }
}