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

kiettuongwork there are several things you can try, I would do it as follows:

<#--
    assuming URL: https://communitystg.digi.com.my/t5/Blog/bg-p/11112222
    with the goal to extract the number at the end, e.g. 11112222
-->

<#assign url = http.request.url />
<#-- first split away any URL parameters, that's the stuff after a question mark "?" what you seem to want is a url-path element, basically what we want is everything before a possible question mark -->
<#assign urlparts = url?split("?")?first />
<#-- we then split that first part at every slash "/" -->
<#assign urlparts = url?split("?")?first?split("/") />
<#-- and eventually select just the last bit of that sequence to get what you want -->
<#assign urlparts = url?split("?")?first?split("/")?last />

<#-- of course you do not need to do that assignment 3 times, once is enough, e.g. like this: -->
<#assign urlparts = url?split("?")?first?split("/")?last />

${urlparts}

hope it helps!

PS: The link to your stage instance of Lithium is blocked by .htaccess, therefore nobody can see your demo-links