pandas.Series.str.count

Series.str.count(pat, flags=0, **kwargs) [source]

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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https://pandas.pydata.org/pandas-docs/version/0.21.1/generated/pandas.Series.str.count.html