I use the regex pattern below to validate a URL

[^@]*-catalog-item+[\d]-current

and it works fine for me, matching URLs like this:

http://www.mydomain.com/sports-catalog-item+30993-current

However, I now need it to not match the following 4 URLs:

http://www.mydomain.com/sports-catalog-item+2016-current

http://www.mydomain.com/sports-catalog-item+40352-current

http://www.mydomain.com/sports-catalog-item+21-current

http://www.mydomain.com/sports-catalog-item+93125-current

Could somebody help me to modify my regex to not match a URL that ends in those four specific numbers?

I don't need to worry about the stuff before the plus sign.

In other words, I don't want a match on http://www.mydomain.com/anythinghere-catalog-item+93125-current

So, all I care about it not having a match for those specific digit combinations before the -current

Thanks for any help you can provide.

I think I figured this out.

First, I correct my original regular expression to recognize that + is a special character, and I got the repeat on the digits:

[^@]*-catalog-item\+[\d]*-current 

 Then I added a negative lookahead, as follows

[^@]*-catalog-item\+(?!2016-c|40352-c|21-c|93125-c)[\d]*-current 

This is my first time doing a negative lookahead, but I think it works. I would appreciate somebody who knows what they are doing giving it a quick lookover to tell me if I did it right.

By the way, I notice that the negative lookahead is usually inside of parens. Does this mean $1 will equate to, e.g., 2016-c or does a negative lookahead not count as a match?

 Thanks.