1    package ch.jai.java.example; 
2     
3    import junit.framework.TestCase; 
4     
5    import java.util.regex.Pattern; 
6     
7    /** 
8     * Pattern Example 
9     * 
10    * @author www.jai.ch 
11    */ 
12   public class Pattern_Example extends TestCase { 
13       /** 
14        * 
15        */ 
16       public void test_match_simple() { 
17    
18           // match for : whitespace characters 
19           String regex = "\\s+"; 
20           assertTrue(" \t\n".matches(regex)); 
21           assertFalse("a".matches(regex)); 
22    
23           // match for : non-whitespace characters 
24           regex = "\\S+"; 
25           assertTrue( "abc.123".matches(regex)); 
26           assertFalse( "abc 123".matches(regex)); 
27    
28           // match for : 2 or more non-whitespace characters 
29           regex = "\\S{2,}"; 
30           assertTrue( "ab".matches(regex)); 
31           assertTrue( "abc".matches(regex)); 
32           assertFalse( "a".matches(regex)); 
33    
34           // match for : 2 or 3 non-whitespace characters 
35           regex = "\\S{2,3}"; 
36           assertTrue( "ab".matches(regex)); 
37           assertTrue( "abc".matches(regex)); 
38           assertFalse( "abcd".matches(regex)); 
39       } 
40       /** 
41        * 
42        */ 
43       public void test_match_numbers() { 
44    
45           // d : A digit: [0-9] 
46           String regex = "\\d+"; 
47           assertTrue( "123".matches(regex)); 
48           assertFalse( "a".matches(regex)); 
49    
50           // d : A digit: [0-9] 
51           regex = "first a string then the numer \\d+"; 
52           assertTrue( "first a string then the numer 123456".matches(regex)); 
53           assertFalse( "first a string then the numer one".matches(regex)); 
54       } 
55       /** 
56        * 
57        */ 
58       public void test_match_email() { 
59    
60           final String emailRegEx = "\\S+@\\S{2,}\\.\\S{2,3}"; 
61    
62           // correct email strings 
63           final boolean matches = Pattern.matches(emailRegEx, "info@jai.ch"); 
64           assertTrue( matches); 
65    
66           // same result from String class 
67           assertTrue( "info@jai.ch".matches(emailRegEx)); 
68           assertTrue( "firstname.lastname@javasoft.com".matches(emailRegEx)); 
69    
70           // incorrect email strings 
71           assertFalse( "i nfo@jai.ch".matches(emailRegEx)); 
72           assertFalse( "info@jai ch".matches(emailRegEx)); 
73           assertFalse( "info jai.ch".matches(emailRegEx)); 
74           assertFalse( "@jai.ch".matches(emailRegEx)); 
75           assertFalse( "info@jaich".matches(emailRegEx)); 
76           assertFalse( "".matches(emailRegEx)); 
77           assertFalse( "info@jai:ch".matches(emailRegEx)); 
78           assertFalse( "boda@jai.c".matches(emailRegEx)); 
79       } 
80   } 
81