import java.io.InputStreamReader;
import java.io.BufferedReader;
import java.util.regex.Pattern;
import java.util.regex.Matcher;

public class RegexTestHarness {

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

    BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
 
    while (true) {

      System.out.print("\nEnter your regex: ");
      Pattern pattern = Pattern.compile(in.readLine());

      System.out.print("\nEnter input string to search: ");
      Matcher matcher = pattern.matcher(in.readLine());

      boolean found = false;
      while (matcher.find()) {
	System.out.format("I found the text \"%s\" starting at " +
			  "index %d and ending at index %d.%n",
			  matcher.group(), matcher.start(), matcher.end());
	found = true;
      }
      if (!found) {
	System.out.format("No match found.%n");
      }
    }
  }
}