Option to control string trimming

[dev-juju]

Is your feature request related to a problem? Please describe.
Strings are always left trimmed? Also strings are never right trimmed? Seems like a very narrow implementation. Trimming should be optional.

Example input: "00123 -- vh4 ll9 whu "
if my start is 6 or 7 for example,
the returned string is: "-- vh4 ll9 whu "
but expected string is: " -- vh4 ll9 whu "

Describe the solution you'd like
Can you add a config option to specify whether strings should be trimmed. We should be able to specify if we want left trimming, right trimming, none or both.

[jtarvainen]

+1 for this request