import java.util.regex.*;

  public class ValidationTest{
     public static void main(String args[]){
         String candidate = "I love Java 4";
         String pattern ="Java \\d";
         System.out.println(candidate.matches(pattern));
     }
  }

   import java.util.regex.*;

   public class ValidationTestWithPatternAndMatcher{
      public static void main(String args[]){
   // Compile the pattern
   Pattern p = null;
   try{
     p = Pattern.compile("Java \\d");
   }
   catch (PatternSyntaxException pex){
      pex.printStackTrace();
      System.exit(0);
   }

   //define the matcher string

   String candidate = "I love Java 4";
   //get the matcher
   Matcher m = p.matcher(candidate);

   System.out.println("result=" + m.find());
   }
}

public class StyleSearchAndReplace{
  public static void main(String args[]){

    String statement = "The question as to whether the jab is"+
    " superior to the cross has been debated for some time in"+
    " boxing circles. However, it is my opinion that this"+
    " false dichotomy misses the point. I call your attention"+
    " to the fact that the best boxers often use a combination of"+
    " the two. I call your attention to the fact that Mohammed"+
    " Ali,the Greatest of the sport of boxing, used both. He had"+
    " a tremendous jab, yet used his cross effectively, often,"+
    " and well";

    String newStmt=
    statement.replaceAll("The question as to whether","Whether");

    newStmt= newStmt.replaceAll(" of the sport of boxing","");
    newStmt=newStmt.replaceAll("amount of success","success");
    newStmt=
     newStmt.replaceAll("However, it is my opinion that this","This");

    newStmt= newStmt.replaceAll("a combination of the two","both");
    newStmt= newStmt.replaceAll("This is in spite of the fact that"
     +" the", "The");
    newStmt=
     newStmt.replaceAll("I call your attention to the fact that","");

    System.out.println("BEFORE:\n"+statement + "\n");
    System.out.println("AFTER:\n"+newStmt);
   }
}

public class StyleSplitExample{
   public static void main(String args[]){
      String phrase1= "but simple justice, not charity";
      strengthenSentence(phrase1);

      String phrase2=
       "but that I love Rome more, not that I love Caesar less";
      strengthenSentence(phrase2);

      String phrase3=
      "ask what you can do for your country, ask not what your "
      + "country can do for you";
      strengthenSentence(phrase3);
   }
   /**
   * Splits and rearranges the given String, hopefully to a more
   * powerful effect.
   * @param sentence is a String representing the phrase we want to
   * strengthen.
   * @returns is a String representing the modified phrase.
   */
   public static String strengthenSentence(String sentence){
      String retval=null;

      String[] tokens = null;

      String splitPattern = ",";

      tokens= sentence.split(splitPattern);

      if (tokens==null){
         String msg = "   NO MATCH: pattern:" + sentence
             + "\r\n             regex: " + splitPattern;
      }
      else{
         retval = tokens[1] + ", " + tokens[0];
         System.out.println("BEFORE: " + sentence);
         System.out.println("AFTER : " + retval +"\n");
      }
      return retval;
   }
}

public class Split{
   public static void main(String args[]){

      String statement = "I will not compromise. I will not "+
      "cooperate. There will be no concession, no conciliation, no "+
      "finding the middle group, and no give and take.";

      String tokens[] =null;

      String splitPattern= "compromise|cooperate|concession|"+
      "conciliation|(finding the middle group)|(give and take)";

      tokens=statement.split(splitPattern);

      System.out.println("REGEX PATTERN:\n"+splitPattern + "\n");

      System.out.println("STATEMENT:\n"+statement + "\n");
      System.out.println("\nTOKENS");
      for (int i=0; i < tokens.length; i++){
      System.out.println(tokens[i]);
      }
   }
}