Removing Specific Processing-Instruction

I've been playing around with this, and haven't been able to figure out how to 
remove the processing instruction:

<?Pub Foobar?>

without also removing others like:

<?Pub 12343?>

<xsl:template match="processing-instruction('Pub')">
</xsl:template>

I've tried using if and choose statements with value-of select, but to no 
avail.  If anyone has any recommendations, I'd really appreciate it.

Thanks,

Mark

 XSL-List info and archive:  http://www.mulberrytech.com/xsl/xsl-list