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Official Gyro-n Payments Java SDK

There is a newer version: 0.11.17

package jp.gopay.sdk.utils;

import java.util.regex.Pattern;

public class TextUtils {
    public static boolean isDigitsOnly(CharSequence str) {
        final int len = str.length();
        for (int i = 0; i < len; i++) {
            if (!Character.isDigit(str.charAt(i))) {
                return false;
            }
        }
        return true;
    }

    /**
     * Returns true if the string is null or 0-length.
     * @param str the string to be examined
     * @return true if str is null or zero length
     */
    public static boolean isEmpty(CharSequence str) {
        return (str == null || str.length() == 0);
    }

    /**
     * Helper function to verify that domains associated with application tokens satisfy the requirements of the API.
     * @param domainString
     * @return true if the provided string satisfies the acceptable domains regex, and false otherwise.
     */

    public static boolean URLRegexVerifier(String domainString){
        Pattern pattern = Pattern.compile("^[a-zA-Z0-9\\-\\_\\.]*$");
        return pattern.matcher(domainString).matches();
    }
}