ProductSelector: Match product identifier exactly

Resolve issues when a product ID is a subset of another

Author: TasoOneAsia

layouts/partials/sidebar-v2.html

@@ -20,7 +20,7 @@
             {{ range $product := $group.products }}
               {{ if not $product.extUrl }}
                 {{ $escaped := replace $product.url "/" "\\/" }}
-                {{ $pattern := printf "/%s(|$)" $escaped }}
+                {{ $pattern := printf "/(%s)/" $escaped }}
                 {{ if strings.FindRE $pattern $normalizedPath }}
                   {{ $currentProductTitle = $product.title }}
                 {{ end }}