Using regular expressions to find img tags without an alt attribute

Question

I am going through a large website (1600+ pages) to make it pass Priority 1 W3C WAI. As a result, things like image tags need to have alt attributes.

What would be the

Answer 1

This is perfectly possible with following regEx:

Looking for something that isn't there, is rather tricky, but we can trick them back, by looking for a group that doesn't start with 'a', or an 'a' that doesn't get followed by an 'l' and so on.