API: Series.str.match == extract? #5075
Description
This is the whatsnew example. I think for compat, the 3rd entry should be (np.nan, 3) ?
In [1]: Series(['a1', 'b2', '3']).str.match('(?P<letter>[ab])?(?P<digit>\d)') Out[1]: 0 (a, 1) 1 (b, 2) 2 (None, 3) dtype: object