diesel expression help

[Travis_M 0]

Looking to create a diesel expression for a file name in order to display just the first 10 spaces. the file names vary in length so a "set" standard of subtracting will not work for me. 

ex. mem-eng-001 cabinet bom.dwg

      mem-eng-002 XXX view for cabinet 03 topdown view.dwg

the current expression I am trying to get to work is 

$(substr,$(getvar,"dwgname"),1,$(-,$(strlen,$(getvar,"dwgname")),4))
I figure it is either something simple I am just not seeing or it is something else entirely. so any help that can be provided is appreciated. 

[steven-g 167]

2 hours ago, Travis_M said:

Looking to create a diesel expression for a file name in order to display just the first 10 spaces.

 

 

Substr

Returns the substring of string , starting at character start and extending for length characters. $(substr, string, start [, length]) Characters in the string are numbered from 1. If length is omitted, it returns the entire remaining length of the string.

$(substr,$(getvar,"dwgname"),1,10)