iRule syntax error - undefined procedure

Figured it out...had a close bracket in the wrong place!

This works:

when HTTP_REQUEST {
    switch -exact -- [string tolower [HTTP::host]] "url-uat.something.com" {
        if {[HTTP::path] starts_with "/patha"} {
            pool patha_uat_443_pool
        } elseif {[HTTP::path] starts_with "/pathb" } {
            pool pathb_uat_443_pool
        } elseif {[HTTP::path] starts_with "/" } {
            pool uat_443_pool
        } else {
            drop
        }
  } "url-prod.something.com" {
        if {[HTTP::path] starts_with "/patha"} {
            pool patha_prod_443_pool
        } elseif {[HTTP::path] starts_with "/" } {
            pool prod_443_pool
        }    
    }   default {
        drop
    }
}