Java Regex Number Validate isNumber(String str)

Description

is Number

License

Open Source License

Declaration

public static boolean isNumber(String str) 

Method Source Code

//package com.java2s;

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

public class Main {

    public static boolean isNumber(String str) {
        if (isNull(str)) {
            return false;
        }//from ww w. j av a2s .  c o  m
        Pattern p = Pattern
                .compile(new StringBuilder("[-]?+[0-9]{").append((str.length() == 0 ? 1 : str.length() - 1))
                        .append(",").append(str.length()).append("}").toString());
        Matcher m = p.matcher(str);
        return m.matches();
    }

    public static boolean isNull(String str) {

        return (str == null || str.trim().length() == 0);
    }
}

Related

1. isNumber(String data)
2. isNumber(String number)
3. isNumber(String s)
4. isNumber(String s)
5. isNumber(String s, boolean[] realnum)
6. isNumber(String str)
7. isNumber(String str)
8. isNumber(String str)
9. isNumber(String str)