how to swap folder order with regexp_substitutions in nipype?

[binarybottle]

The following did not switch the order of folder names "left_surface" and the subject name folder:

Sink.inputs.regexp_substitutions = [(r'/left_surface/(.*)/', r'/\1/left_surface/')]

[satra]

In [8]: str = 'asdasd/adas/atlas/fooo/asdasd'

In [9]: re.subn(r'/atlas/(.*)/', r'/\1/atlas/', str)
Out[9]: ('asdasd/adas/fooo/atlas/asdasd', 1)

remember substitution order:

ordered standard string substitions then ordered regexp substituions