Finding Every Occurrence of the Letter A : Group « Regular Expressions « Java Tutorial

1. Java Tutorial
2. Regular Expressions
3. Group

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

public class FindA {
  public static void main(String args[]) throws Exception {

    String candidate = "A Matcher examines the results of applying a pattern.";

    String regex = "\\ba\\w*\\b";
    Pattern p = Pattern.compile(regex);

    Matcher m = p.matcher(candidate);
    String val = null;
    System.out.println("INPUT: " + candidate);

    System.out.println("REGEX: " + regex + "\r\n");

    while (m.find()) {
      val = m.group();
      System.out.println("MATCH: " + val);
    }
    if (val == null) {
      System.out.println("NO MATCHES: ");
    }
  }
}