I want to change a font element to an XHTML compatible variant.

e.g.

find

<font face="arial" size="1" color="red" >hello world</font>

replace

<span style='font-family: arial; font-size: 1; color: red;'>hello world</span>

note:
- the font attributes can change order
- the font attributes can have e.g. only a title attribute

Can you guys help me out with a nice regexp pattern?