Look at the following minimal example:
>>> import re
>>> p = re.compile(r"(:?Test) (String)")
>>> m = p.search("This is a Test String OK?")
>>> m.groups()
('Test', 'String')
I would have expected this to produce:
('String')
since (:?...) should be a non-capturing group. From the module
reference:
(?:...)
A non-grouping version of regular parentheses. Matches whatever
regular expression is inside the parentheses, but the substring matched
by the group cannot be retrieved after performing a match or referenced
later in the pattern.
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