I'm trying to write something and I almost have it... almost...

What I have:
1. This needs to be bolded. The rest does not. There may be several. Sentences, that is.
What I need to end up
1. <p><b>This needs to be bolded.</b> The rest does not. There may be several. Sentences, that is.</p>
Searching: ([0-9]+)\. (.*\.) (.*)
replacing with: \1. <p><b>\2</b> \3</p>
got me this:
1. <p><b>This needs to be bolded. The rest does not. There may be several.</b> Sentences, that is.</p>
So it found the LAST period-space, not the first one.
When I tried the search using this: ([0-9]+)\. (.*)\. (.*)
I still got this:
1. <p><b>This needs to be bolded. The rest does not. There may be several</b> Sentences, that is.</p>
So I wondered, how do I get it to STOP at the FIRST period?
([0-9]+)\. ([.*.])(.*)
and
([0-9]+)\. ([.*\.])(.*)
Don't 'find' it. I thought adding the period in brackets after the 'find all' .* would say "go to that char and stop" but apparently not, and 'escaping' it didn't help.
Would appreciate any insight. Must be something obvious I'm missing.
PJ