[xsl] Trying to replace vertical pipe...

I'm sure I can't be the first to face this, but have been unable to track down a 
solution...

I'm trying to replace the string "|95|" with a single character but the 
"replace()" function seems to interpret the vertical bars as "or" and won't 
allow it, complaining about a "zero-length string".

How would I escape |95| in order for it to be treated it as a string and enable 
it to be replaced?

Thanks

Paul