Checks, whether is username empty or has invalid format (ie. no email) - Android java.util.regex

Android examples for java.util.regex:Email Pattern

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Description

Checks, whether is username empty or has invalid format (ie. no email)

Demo Code

/***********************************************************************************************************************
 *
 * This file is part of the eeg-database-for-android project

 * ==========================================
 *
 * Copyright (C) 2013 by University of West Bohemia (http://www.zcu.cz/en/)
 *
 ***********************************************************************************************************************
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on
 * an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the
 * specific language governing permissions and limitations under the License.
 *
 ***********************************************************************************************************************
 *
 * Petr Je?ek, Petr Miko/*ww  w.ja v  a2s  .com*/
 *
 **********************************************************************************************************************/
//package com.java2s;

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

public class Main {
    /**
     * Checks, whether is username empty or has invalid format (ie. no email).
     *
     * @param username credentials username
     * @return true if username is invalid
     */
    public static boolean isUsernameFormatInvalid(String username) {
        return isEmpty(username) || !isEmailValid(username);
    }

    /**
     * Checks, if is string not empty or not initialized.
     *
     * @param s string reference
     * @return true if is string empty or not initialized
     */
    public static boolean isEmpty(String s) {
        return s == null || s.trim().isEmpty();
    }

    /**
     * Checks, whether is provided string a valid mail address.
     *
     * @param email email address
     * @return true if is string a valid email address
     */
    public static boolean isEmailValid(String email) {
        boolean isValid = false;

        String expression = "^[\\w\\.-]+@([\\w\\-]+\\.)+[A-Z]{2,4}$";
        CharSequence inputStr = email;

        Pattern pattern = Pattern.compile(expression,
                Pattern.CASE_INSENSITIVE);
        Matcher matcher = pattern.matcher(inputStr);
        if (matcher.matches()) {
            isValid = true;
        }
        return isValid;
    }
}

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