pandas.Series.str.count
Series.str.count(pat, flags=0, **kwargs)-
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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Licensed under the 3-clause BSD License.
https://pandas.pydata.org/pandas-docs/version/0.18.1/generated/pandas.Series.str.count.html