Why is the variable and regex slow in saxon and fast i

HI,

I'm unable to figure out why this regex is so very time consuming such
that it does not end in oxygen but works quickly in regex buddy on the
same content.

    <xsl:variable name="BraketedTextRemoved"
       select="replace($title,'\([^\)]*\)','')"/>

I'm just trying to remove content with brackets ( dfd234**#*$#*$#fdfd )

Running on vendor="SAXON 9.2.0.6 from Saxonica" version="2.0"

Any Ideas?

Thanks
Alex