Series.str.count()
pandas.Series.str.count
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Series.str.count(pat, flags=0, **kwargs)
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Count occurrences of pattern in each string of the Series/Index.
Parameters: pat : string, valid regular expression
flags : int, default 0 (no flags)
re module flags, e.g. re.IGNORECASE
Returns: counts : Series/Index of integer values
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© 2008–2014 the pandas development team
Licensed under the 3-clause BSD License.
http://pandas.pydata.org/pandas-docs/version/0.18.1/generated/pandas.Series.str.count.html