Clarify the descriptions of the positive and negative lookbehind assertions. Added examples of positive lookbehind assertions. This closes SF bug #529708.
Clarify the descriptions of the positive and negative lookbehind assertions.
Added examples of positive lookbehind assertions.
This closes SF bug #529708.

sk-/python2.7-type-annotator,sk-/python2.7-type-annotator,sk-/python2.7-type-annotator