MarkLogic 12 EA 1 Product Documentation
fn.substringBefore

fn.substringBefore(
   input as String?,
   before as String?,
   [collation as String]
) as String?

Returns the substring created by taking all of the input characters that occur before the specified $before characters.

Parameters
input	The string from which to create the substring.
before	The string before which the substring is created.
collation	The optional name of a valid collation URI. For information on the collation URI syntax, see the Search Developer's Guide.

fn.substringBefore("abcdef", "def");

=> abc

MarkLogic 12 EA 1 Product Documentationfn.substringBefore