Top Most TIME12HOURS_PATTERN validaty in Java

package com.utility;

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

public class Time12HoursValidator{

 private Pattern pattern;
 private Matcher matcher;

 private static final String TIME12HOURS_PATTERN =
                                "(1[012]|[1-9]):[0-5][0-9](\\s)?(?i)(am|pm)";

 public Time12HoursValidator(){
 pattern = Pattern.compile(TIME12HOURS_PATTERN);
 }

 public boolean validate(final String time){
 matcher = pattern.matcher(time);
 return matcher.matches();      
 }
}