iRules vs Polices

I am trying to replicate the following iRule with a LTM Policy. iRule works, policy doesnt work. Does it support regex? How can I match just a / with nothing before or after without regex? iRule:

if {[string tolower [HTTP::uri]] matches_regex {^/$}} { HTTP::redirect "; }}

Policy:

rules {
    "Default Page Redirect" {
        actions {
            0 {
                http-reply
                redirect
                location http://example.com/external/example.jspx
            }
            1 {
                log
                write
                facility local0
                message "tcl: [HTTP::path]"
                priority debug
            }
        }
        conditions {
            0 {
                http-uri
                path
                values { ^/$ }
            }
        }
    }