How do you remove all the alphabetic characters from the string except the numerical characters? tried all the present answers

Question

I have two types of data in my column. I want to remove all the alphabetical characters and keep the digits. I have tried all the regex solution present on SO.

df['numbers']=df['numbers'].str.replace('(/d+)','')

df['numbers']=df['numbers'].str.replace('[A-Z]+','')

and similar ways to remove the alphabets.

Data:

numbers
1N
5
5E
7
8E

Expected output:

1
5
5
7
8

Actual outptut:

numbers
1
nan
5
nan
8

Answer 1

This problem is because, alphanumerics are strings while the numbers are integers.

df['number'] = df['number'].astype('str')
df['number'] = df['number'].str.replace('[A-Z]+','',regex=True)