So I have this string:
My question is, how would I get the number 3 after the term “DataStoresUsed” from the whole string?
Solution wise, id imagine @eatfatdie’s method would also work but I did not test, I just found @Rare_tendo’s one neater so went with it.
It is a string not a table unfortunatly 
Side note, ignore the 115 at the end of the string.
This looks like a JSON table from an HTTP request.
Convert it to a normal table by using JSONDecode()
https://developer.roblox.com/en-us/api-reference/function/HttpService/JSONDecode
Once you do that you should be able to index it like you would with any other table.
i’d do something like this, not sure if it’d work or not
local Table = {}
for w in string.gfind("your string here", ":(%d+)") do
table.insert(Table, w)
end
gfind iterates over each term that contains digits after :s and the for loop inserts it into a table
if you just want the term after “DataStoresUsed” you can do
string.find("your string here", '"DataStoresUsed":(%d+)')
local dataStoresUsed = str:match("\"DataStoresUsed\":(%d+)")
print(dataStoresUsed)
This seems like JSON, so you could’ve decoded it
Unfortunately that does not fit with ym use case since it would involve calling JSONDecode on my same string twice which im not very satisfied with on the efficiency side
Why would you need to call JSONDecode twice?
As I said, its specific to my use case, im making a datastore that can store a string more then 1,000,000 characters long, so I would have to decode the first segment to find the amount of datastore keys I have to search through, then decode the combined string which includes the original to get my full value.