You Just have to understand the
StringSplitSA
Server action logic. It fulfill the requirement. Server action as a function cannot be use at UI expression but it can be use at server side expression. So, this is what I did, after fetching the data from Table, just used the StringSplitSA to get the desire value and assign it. 
You can do the same by Javascript. But same can be achieved by Outsytems text action like String split, rgex search and replace.
Thanks.