| Title | Test
                    Find
                    
                    Validate IP port number (1-65535) | 
            
                | Expression | :(6553[0-5]|655[0-2][0-9]\d|65[0-4](\d){2}|6[0-4](\d){3}|[1-5](\d){4}|[1-9](\d){0,3}) | 
            
                | Description | This was based on the regex in the source but it was buggy so I fixed it and then optimized it.
It matches port numbers in the form of :1 to :65535
This is designed to be plugged onto the end of your favourite url regex because when I was looking for a IPv4 regex I noticed that a lot of them either didn't match the port or matched it badly (allowing the port number to start with a 0 or be higher than 65535)
This regex solves those two problems. | 
            
                | Matches | :1  |  :65535  |  :2546 | 
            
                | Non-Matches | :99999  |  :0684  |  :2ab23 | 
            
                | Author | Rating:
                        
Not yet rated.
                    Matthew Harris | 
            
                | Source | http://social.msdn.microsoft.com/Forums/en-US/regexp/thread/bc7f5bc2-ac30-434b-9ae9-908d602ee6ea | 
            
              | Your Rating |  | 
        
    
 
    
    
     
        
                
	                Title: thanks
	                Name: MC
	                Date: 3/29/2020 5:04:06 PM
	                Comment: 
Just wondering if this counts as further optimisation or not?
:(6553[0-5]|655[0-2][0-9]\d|65[0-4](\d){2}|[1-5](\d){4}|[1-9](\d){0,3})
                
                
            
                
	                Title: Thx
	                Name: pach
	                Date: 10/30/2012 9:11:59 AM
	                Comment: 
thank you Matthew for this expression ! thanks to Szaky too. you're perfectly right
                
                
            
                
	                Title: mistyped
	                Name: Szaky
	                Date: 1/20/2010 2:22:48 AM
	                Comment: 
Expression mistyped: second part requests an IP with 6 digits, e.g. 655000 would do. Remove the unnecessary [0-9].