正则表达式使用语句

package corejava.ioutils;

import java.util.Scanner;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
//行动力
public class RegexTestHarnessV5 {

 public static void main(String[] args) {
  Scanner scanner = new Scanner(System.in);
  while (true) {
   System.out.printf("%nEnter your regex: ");
   Pattern pattern = Pattern.compile(scanner.nextLine());
   System.out.printf("Enter input string to search: ");
   Matcher matcher = pattern.matcher(scanner.nextLine());
   boolean found = false;   
   while (matcher.find()) {
    System.out.printf("Found \"%s\" starting index %d ending index %d.%n",
      matcher.group(), matcher.start(), matcher.end());
    found = true;
   }
   if (!found) {
    System.out.printf("No match found.%n");
   }   
  }
 }
}