java正则表达式

//Allows you to easilly try out regular exprexxions

import java.util.regex.*;

public class TestRegularExpression
{
 public static void main(String args[])
 {
  if (args.length<2)
  {
   System.out.println("Usage:/njava TestRegularExpression" + "characterSequence regularExpression+");
   System.exit(0)
  }
  System.out.println("Input : /""+ args[0] + "/"");
  for(String arg:args)
  {
   System.out.println("Regulae expression: /""+ arg +"/"");
   Pattern p = Pattern.compile(arg);
   Matcher m = p.matcher(args[0]);
   while (m.find())
   {
    System.out.println("Match /""+ m.group()+"/" at positions"+ m.start() +"-" + (m.end) -1);
   }
  }
  
 }
}