asp.net - Regex to match url not for certain file types

Question

I want my Regex to match all valid URLs that do not end with

.gif
.jpg
.jpeg
.pdf
.doc

I tried

http(s)?://([w-]+.)+[w-]+(/[w- ./?%&=;]*)?((?!jpg)|(?!gif)|(?!doc))

Answer 1

You need to use a lookbehind for that, try

http(s)?://([w-]+.)+[w-]+(/[w- ./?%&=;]*)?(?<!jpg)(?<!gif)(?<!doc)$

You need also the anchor $ at the end, it matches the end of the string, that is important to define clearly the point from where the lookbehind should look behind.

See it here on Regexr