Find and replace with wildcards

Hello all.  I'm new to Dreamweaver, and I've tried to find the answer on my question, but to no avail.

I am looking to use Find and Replace to delete extraneous code not needed in the projects I am working on.  Even though this is specifically having to do with bolding text, I'm not sure how to approach it because of the variables needed.

An example would be this:

<span style="font-family: Arial, sans-serif;

  mso-fareast-font-family: 'Times New Roman';

  mso-font-kerning: 18.0pt; mso-bidi-font-weight: bold;

  font-weight: bold;">ABCD</span>

would need to be changed to this:

<span style="font-weight: bold;">ABCD</span>

Or this:

<span style="line-height: 115%;

  font-family: Arial, sans-serif; font-weight: bold;">ABCD</span>

to:

<span style="font-weight: bold;">ABCD</span>

The problem I'm having is to somehow make sure that if font-style: is included in the style, it is not omitted.  E.g.

<span style="font-weight: bold; font-style: italic;">

In this case, I would need the search string to be able to leave the italicized formatting.  Would anyone have any ideas?  Maybe a replace string that leaves all instances of font-weight and font-style?  If it helps at all, these pages have already been developed in RoboHelp.  But with over 13,000 pages, it would take a while to do it all by hand.