python - Pandas dataframe replace with regex doesn't work -

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i have dataframe many rows. want use pd.replace replace values in entire columns. 

import pandas pd import re list = ['md 15241', 'md', 'td', 'td 15487'] = pd.dataframe(list) b = a.copy()  b.replace(r'[a-z]{2}', 'usa', inplace = true) b

output 

    0 0   md 15241 1   md 2   td 3   td 15487

i tried r'md' or r'td' , works.

you need regex=true in replace method:

b.replace(r'[a-z]{2}', 'usa', inplace=true, regex=true)  b #0 #0  usa 15241 #1  usa #2  usa #3  usa 15487

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