Why won't this regular expression match anything in VSCode search & replace?

I'm using the VSCode

Screenshot to demonstrate the search options I have selected:

And here is the expression I'm trying to use. It works in other places, such as regexr.com, but not in VSCode...

font\-size\:\s{0,1}\d{2,2}px\;\s{0,1}

Here is the HTML:

https://codepen.io/JashoowellPadderssonn/pen/WNbVVEq

I have also tried disabling all extensions which did not work. Here are my VSCode settings:

https://gist.github.com/CrocodileInAWhileAlligatorLater/409f0d9d179955ff80419a8a4506a09d