Java Tutorial: Regular Expressions, Class Pattern and Class Matcher (Page 2)

Java How to Program, 6/e
	ISBN: 0-13-148398-6 © 2005 pages: 1576 Buy the Book!

This tutorial presents Java powerful regular-expression processing capabilities using class Pattern, class Matcher and class String's matches method. This tutorial is intended for students and developers who are familiar with basic Java string-processing techniques.

Download the code for this tutorial here.

[Note: This tutorial is an excerpt (Section 29.7) of Chapter 29, Strings, Characters and Regular Expressions, from our textbook Java How to Program, 6/e. This tutorial may refer to other chapters or sections of the book that are not included here. Permission Information: Deitel, Harvey M. and Paul J., JAVA HOW TO PROGRAM, ©2005, pp.1378-1387. Electronically reproduced by permission of Pearson Education, Inc., Upper Saddle River, New Jersey.]

29.7 Regular Expressions, Class Pattern and Class Matcher (Continued)

   1  // Fig. 29.21: Validate.java
   2  // Validate user information using regular expressions.
   3  import java.util.Scanner;
   4  
   5  public class Validate
   6  {
   7     public static void main( String[] args )
   8     {
   9        // get user input
  10        Scanner scanner = new Scanner( System.in );
  11        System.out.println( "Please enter first name:" );
  12        String firstName = scanner.nextLine();
  13        System.out.println( "Please enter last name:" );
  14        String lastName = scanner.nextLine();
  15        System.out.println( "Please enter address:" );
  16        String address = scanner.nextLine();
  17        System.out.println( "Please enter city:" );
  18        String city = scanner.nextLine();
  19        System.out.println( "Please enter state:" );
  20        String state = scanner.nextLine();
  21        System.out.println( "Please enter zip:" );
  22        String zip = scanner.nextLine();
  23        System.out.println( "Please enter phone:" );
  24        String phone = scanner.nextLine();
  25  
  26        // validate user input and display error message
  27        System.out.println( "\nValidate Result:" );
  28  
  29        if ( !ValidateInput.validateFirstName( firstName ) )
  30           System.out.println( "Invalid first name" );
  31        else if ( !ValidateInput.validateLastName( lastName ) )
  32           System.out.println( "Invalid last name" );
  33        else if ( !ValidateInput.validateAddress( address ) )
  34           System.out.println( "Invalid address" );
  35        else if ( !ValidateInput.validateCity( city ) )
  36           System.out.println( "Invalid city" );
  37        else if ( !ValidateInput.validateState( state ) )
  38           System.out.println( "Invalid state" );
  39        else if ( !ValidateInput.validateZip( zip ) )
  40           System.out.println( "Invalid zip code" );
  41        else if ( !ValidateInput.validatePhone( phone ) )
  42           System.out.println( "Invalid phone number" );
  43        else
  44           System.out.println( "Valid input.  Thank you." );
  45     } // end main
  46  } // end class Validate

Fig. 29.21

Inputs and validates data from user using the ValidateInput class.

 
Please enter first name:
Jane
Please enter last name:
Doe
Please enter address:
123 Some Street
Please enter city:
Some City
Please enter state:
SS
Please enter zip:
123
Please enter phone:
123-456-7890
 
Validate Result:
Invalid zip code

 
Please enter first name:
Jane
Please enter last name:
Doe
Please enter address:
123 Some Street
Please enter city:
Some City
Please enter state:
SS
Please enter zip:
12345
Please enter phone:
123-456-7890
 
Validate Result:
Valid input.  Thank you.

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