[Swift-user] Mapper padding

[David Kelly]

Mike suggested I try using regular expressions. This works by prepending my number with seven 0s, then using a regular expression to get the last 8 numbers. 

string longname = @strcat("0000000", i); 
string filename = @strcut(longname, "([0-9]........$)"); 

I tried to [0-9]{8}$, but it got confused parsing and thought I was trying to reference a variable called 8, so I had to use the dots. 
----- Original Message -----

> From: "David Kelly" <davidk at ci.uchicago.edu>
> To: "swift user" <swift-user at ci.uchicago.edu>
> Sent: Friday, June 28, 2013 1:55:53 PM
> Subject: [Swift-user] Mapper padding

> Hello,

> I'm writing a swift script where I'm trying to use the value of an
> integer to find and map a file. The filename I'm trying to map has
> the number in it, but is always padded with 0s to make it exactly 9
> numbers long. The filename for 64 would be 000000064.csv, for
> example. My number can be any value from 0 to 999999999.

> Is there a way to easily build the filename string using any of the
> existing string libraries? As far as I know we don't have a
> printf-like way to format this at the moment.

> Is there a way to do this with mapper padding?

> I can do it with an ext mapper, just wondering if there's a better
> way.

> Thanks,
> David

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