| 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 | 
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              | Your Rating | 
              
                
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	                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