MarkLogic 9 Product Documentation
fn.substring

fn.substring(
   sourceString as String?,
   startingLoc as Number,
   [length as Number]
) as String?

Returns a substring starting from the $startingLoc and continuing for $length characters.

Parameters
sourceString	The string from which to create a substring.
startingLoc	The number of characters from the start of the $sourceString.
length	The number of characters beyond the $startingLoc.

fn.substring("123456", 2, 2);

=> "23"

MarkLogic 9 Product Documentationfn.substring