This module provides an extension to HTML::Template which allows
expressions in the template syntax.  This is purely an addition - all
the normal HTML::Template options, syntax and behaviors will still
work.  See HTML::Template for details.

Expression support includes comparisons, math operations, string
operations and a mechanism to allow you add your own functions at
runtime.

WWW: http://search.cpan.org/dist/HTML-Template-Expr/