U can do the following way
Initislse a list list_1= New List (Of String)
- Use for each loop to loop through array
Inside it use an if Condition with condition as
item.Contains(specific text),
If it is true
Then use add to collections activitiy for adding item to list_1
After adding required items to collections
At the exit, use
list_1.ToArray to convert list to array
As u can’t add items to array so add items to list and convert list to array, this is the overall logic applied here.
Hope it helps you
Regards
Nived N 
Happy Automation 