Regular Expression

[Nilesh Garje]

Why program print Invalid Mobile Number?

package com.nit.regex;
import java.util.regex.Pattern;
import java.util.regex.Matcher;
public class RegexDemoMobileNo
{
	public static void main(String[] args) 
	{ 
		Pattern pattern=Pattern.compile("(0|91)?[7-9][0-9]{9}");
		Matcher matcher=pattern.matcher(args[0]);
		System.out.println(matcher.find()); 
		 if(matcher.find())
		{ 
			System.out.println("Valid Mobile Number");
		}
		else
		{
			System.out.println("InValid Mobile Number");
		}
	 }
}
/*
//Output:

E:\scjpprogram\OCP>javac -d . RegexDemoMobileNo.java
E:\scjpprogram\OCP>java com.nit.regex.RegexDemoMobileNo 9595542326
true
InValid Mobile Number
E:\scjpprogram\OCP>
*/

[Campbell Ritchie]

Because you are calling find() twice; you only find the number once, then on the second attempt it will return false.

[Campbell Ritchie]

Don't use com.nit in your package names because somebody else owns that web address.

[Nilesh Garje]

Thanks Ritchie