Help with wildcard find replace

[J]

I am using wildcard to find the number string after the colon.

NO: is the constant - the number is variable.
NO: 1.201

I can't seem to format the find correctly.

I tried <[N][O]:>_ _ ([0-9].[0-9]{2,3}) and a couple other versions. I
didn't type underscores in the find, I just included here a to show
the spaces. Not sure how to handle that. I tried without spaces, too.

I would have replaced with: <a name="\2">\2</a> or something like
that.


What is proper way to find this string?

Thanks for your help