java正则表达式

Question

Java的正则表达式怎么验证一个数在0-493和500的数字

Answer 1

[code="java"]
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class Test {

public static String modify(int numb){

    if(numb<10)
        return "00"+numb;
    else if (numb <100)
        return "0"+numb;
    else 
        return ""+numb;
}

public static void isInRange(int numb){

    String str = Test.modify(numb);

    Matcher m1 = Pattern.compile("^[0-4][0-9][0-9]$").matcher(str);
    Matcher m2 = Pattern.compile("^500$").matcher(str);
    Matcher m3 = Pattern.compile("^49[4-9]$").matcher(str);

    if( m1.matches()){
        if(!m3.matches()){
            System.out.println(str+"匹配");
        }
    }else if(m2.matches()){
        System.out.println(str+"匹配");
    }
}

public static void main(String[] args) {

    Test.isInRange(2);
    Test.isInRange(23);
    Test.isInRange(279);
    Test.isInRange(499);
    Test.isInRange(500);
    Test.isInRange(502);

}

}

[/code]

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