A common dilemma is the need to either strip leading zeros or to have to add leading zeros back on to an Id or Medical Record Number. Here are two functions to handle these situations.
The first one provides you with the ability to add leading zeros in front of any string. You just have to send it the Id as a string and the end length you would like it to be. (In my example I will make it a 10 character number)
Here is the function:
function addZeros(Id, length) Id = string.rep('0', length-#Id)..Id return Id end
The second function will remove all leading zeros in front no matter how many.:
function removeZeros(Id) while true do if Id:sub(1,1) == '0' then Id = Id:sub(2) else break end end return Id end
If you would like to call these just to test them out then you can copy any paste the above functions at the bottom of your script and then use these two function calls from inside main:
local Id1 = removeZeros('0004589787') local Id2 = addZeros('4589787', 10) print(Id1) print(Id2)