String input = "She sells sea shells by the sea shore.";
 
 // Create a Pattern object.  A Pattern is a 
 // compiled representation of a regular expression.
 Pattern pattern = Pattern.compile("shells");
 
 // Create a Matcher object.  A Matcher is an engine that 
 // performs match operations on a character sequence by 
 // interpreting a Pattern.
 Matcher matcher = pattern.matcher(input);
 
 System.out.println(matcher.matches());
 // Prints false.  matcher.matches() attempts to
 // match the entire input sequence against the pattern.  
 // The match would have succeeded, if the pattern described 
 // the entire input String.
 
 System.out.println(matcher.lookingAt());
 // Prints false.  matcher.lookingAt() attempts to 
 // match the input sequence, starting at the beginning, 
 // against the pattern.  The match would have succeeded, 
 // if the pattern were "She".
 
 System.out.println(matcher.find());
 // Prints true.  matcher.find() attempts to find 
 // the next subsequence of the input sequence that 
 // matches the pattern.
 
 // The Matcher must be reset and searched again after 
 // failed attempts at matching.  The Matcher would
 // otherwise not be in a proper state to get the 
 // information related to the last match and methods 
 // that query for such information would throw an 
 // IllegalStateException.  Note that the find() method 
 // resets the Matcher if previous attempts at matching 
 // failed.
 
 System.out.println(matcher.find());   // Prints true.
 
 System.out.println(matcher.group());  // Prints shells.
 
 String[] splits = pattern.split(input);
 System.out.println(splits.length);// Prints 2.
 
 for (int i=0; i < splits.length; i++) // Prints 
 {   // She sells sea
 System.out.println(splits[i]);  //  by the sea shore.
 }
 
 pattern = Pattern.compile("Shells");
 
 // Since a new Pattern is to be used, a new Matcher 
 // must also be used.
 matcher = pattern.matcher(input);
 
 System.out.println(matcher.find()); // Prints false.