How to check string contains numeric or alphabet in java string by using Regex(Regular Expression) ??

package org.cmania;

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

public class StringNumericRegex {

public static void main(String[] args)
{
   Pattern pat = Pattern.compile(".*\\d.*");   // for digit detection only

// Pattern pat = Pattern.compile("[a-zA-Z]+");  for alphabetic detection

// Pattern pat = Pattern.compile("[a-zA-Z ]*\\d+.*");  for digit detection

// org.apache.commons.lang.StringUtils.isAlpha(str); for alphabetic detection

String str = "java8";

/**
* Except for splitting a string, you need to create a Matcher object from the Pattern object.
* The Matcher will do the actual work. The adv of having two separate classes is that
* you can create many Matcher objects from a single Pattern object, and thus apply the
* regular expression to many subject strings simultaneously.
*/

Matcher match = pat.matcher(str);

if (match.matches())
{
     System.out.println("String contains numeric values");
}
else
{
                     System.out.println("String doesn't contain any numberic values");
}

}

}