| Title | Test
                    Find
                    
                    Pattern Title | 
            
                | Expression | ^[0-9]{4}-(((0[13578]|(10|12))-(0[1-9]|[1-2][0-9]|3[0-1]))|(02-(0[1-9]|[1-2][0-9]))|((0[469]|11)-(0[1-9]|[1-2][0-9]|30)))$ | 
            
                | Description | Matches the date format "YYYY-mm-dd" and also validates month and number of days in a month. All leap year dates "YYYY-02-29" passes trough. Could easily be changed to another format. | 
            
                | Matches | 2004-04-30 | 2004-02-29 | 
            
                | Non-Matches | 2004-04-31 | 2004-02-30 | 
            
                | Author | Rating:  Johan Södercrantz | 
            
                | Source |  | 
            
              | Your Rating |  | 
        
    
 
    
    
     
        
                
	                Title: invalid leap years
	                Name: Tester
	                Date: 7/27/2005 3:31:46 AM
	                Comment: 
Your regular expression does not fullt validate leap years... example : 2003-02-29 is validated but it's not an existnig date