This allows 0 values only when followed .01 or greater or any numbers beginning with 1-9 up to 6 digits total followed by optional decimal point + 1 or 2 digits

There's a slight difference between your code and the description.
allows optional decimal point + 0 or 1 or 2 digits so 40.00 could be entered as 40. or as 40 here.

The final ?$ also allows blank input. There's also a set of unnecessary brackets.

Suggestor
If you want to allow people to type .75 instead of 0.75 try:
Remove spaces before using.

Regular expressions give you an infinite number of very fine grained possibilities.

Hi @g1smd

I thought I'd already replied to this but obviously didn't.

The first regex is the cook default, the one I wanted to replace with the longer one which I believe does fit the requirements I specified doesn't it?

Thanks for pointing out the additional brackets! Will remove although the required parameter on the field prevents the user leaving blank.

Thanks again,

Gez

simplifies to