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Official Gyro-n Payments Java SDK

There is a newer version: 0.11.17

package jp.gopay.sdk.models.common;

import java.util.regex.Pattern;

public class EmailAddress implements GoPayEmailAddress {

    private String email;

    private static final String ERROR_MESSAGE = "Must be a valid email address";
    private static final Pattern pattern = Pattern.compile("(?:[a-z0-9!#$%&'*+/=?^_`{|}~-]+(?:\\.[a-z0-9!#$%&'*+/=?^_`{|}~-]+)*|\"(?:[\\x01-\\x08\\x0b\\x0c\\x0e-\\x1f\\x21\\x23-\\x5b\\x5d-\\x7f]|\\\\[\\x01-\\x09\\x0b\\x0c\\x0e-\\x7f])*\")@(?:(?:[a-z0-9](?:[a-z0-9-]*[a-z0-9])?\\.)+[a-z0-9](?:[a-z0-9-]*[a-z0-9])?|\\[(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?|[a-z0-9-]*[a-z0-9]:(?:[\\x01-\\x08\\x0b\\x0c\\x0e-\\x1f\\x21-\\x5a\\x53-\\x7f]|\\\\[\\x01-\\x09\\x0b\\x0c\\x0e-\\x7f])+)\\])");

    public EmailAddress(String email) {
        if (email == null) {
            throw new IllegalArgumentException(ERROR_MESSAGE);
        }
        if (!email.toLowerCase().matches(pattern.pattern())) {
            throw new IllegalArgumentException(ERROR_MESSAGE);
        }
        this.email = email;
    }

    @Override
    public String serialize() {
        return email;
    }
}