How to retrive info from query string and pass into component in Lithium

I also tried as below code in component recent-blog-posts

<#assign url = http.request.url />
<#assign parts = url?split("/") />
<#assign category = parts[(parts?size)-1] />
Hello category ${category}

You can see result at 

https://communitystg.digi.com.my/t5/Blog/bg-p/11112222

Hello category = recent-blog-posts?render_behavior=raw&page=1

It should be Hello category = 11112222

Could you please advise how to retrieve 11112222?

Thanks