XSLT 2.0 Matching characters above 255

Hi,

I would like to wrap any characters above 255 in <span> tags.  I'm not
sure it's possible...

For this input XML:

<root>
  <entry>A &#120514; BCD &#120515; EFG &#120516; </entry>
</root>

The required output is:

<root>
  <entry>A <span>&#120514;</span> BCD <span>&#120515;</span> EFG
<span>&#120516;</span> </entry>
</root>

I thought about using <xsl:analyze-string>, can regex's can do
comparisons like this?

thanks
andrew