Matcher.pattern method : Matcher « Regular Expressions « Java Tutorial

1. Java Tutorial
2. Regular Expressions
3. Matcher

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

public class MainClass {
  public static void main(String args[]) {
    Pattern p = Pattern.compile("\\d");
    Matcher m1 = p.matcher("55");
    Matcher m2 = p.matcher("fdshfdgdfh");

    System.out.println(m1.pattern() == m2.pattern());
  }

}