Regex pattern help for phrase OR a character set

Question

I have a PHP regex that I want to fail if the matched word after /blog is just feed.

This MUST be done within the regex itself, not using any other PHP syntax.

The regex currently looks like this:

blog/([a-zA-Z0-9\-]+)

What would I add to this to properly negate the regex if feed is found after blog/?

Answer 1

Try

'/^blog\/(?!feed$)([a-zA-Z0-9-]+)$/'