Java Regex Number Validate parseNumber(String in)

Description

parse Number

License

Open Source License

Declaration

public static long parseNumber(String in) 

Method Source Code

//package com.java2s;
/*/*from   w  w  w  .  j  a  va 2  s  .  c o m*/
 * Copyright (C) 2010-2014 Laurent CLOUET
 * Author Laurent CLOUET <laurent.clouet@nopnop.net>
 *
 * This program is free software; you can redistribute it and/or 
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; version 2
 * of the License.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 */

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

public class Main {
    public static long parseNumber(String in) {
        in = in.trim();
        in = in.replaceAll(",", ".");
        try {
            return Long.parseLong(in);
        } catch (NumberFormatException e) {
        }
        final Matcher m = Pattern.compile("([\\d.,]+)\\s*(\\w)").matcher(in);
        m.find();
        int scale = 1;
        switch (m.group(2).charAt(0)) {
        case 'G':
        case 'g':
            scale *= 1000;
        case 'M':
        case 'm':
            scale *= 1000;
        case 'K':
        case 'k':
            scale *= 1000;
            break;
        default:
            return 0;
        }
        return Math.round(Double.parseDouble(m.group(1)) * scale);
    }
}

Related

1. isNumeric(String text)
2. isNumeric(String value)
3. isNumericAndCanNull(String src)
4. isNumericAndCanNull(String src)
5. isNumString(String txt)
6. parseNumber(String input)
7. parseNumber(String input)
8. parseNumber(String s)
9. parseNumbers(String str)