REGEX = '\\bdog\\b' : Matcher « Regular Expressions « Java Tutorial

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

public class MatcherDemo {

  private static final String REGEX = "\\bdog\\b";
  private static final String INPUT = "dog dog dog doggie dogg";

  public static void main(String[] args) {
    Pattern p = Pattern.compile(REGEX);
    Matcher m = p.matcher(INPUT); // get a matcher object
    int count = 0;
    while (m.find()) {
      count++;
      System.out.println("Match number " + count);
      System.out.println("start(): " + m.start());
      System.out.println("end(): " + m.end());
    }
  }
}