如果在特定符号上匹配，如何将数据框中的字符串搜索并提取到新列中？

Question

I have a df that has non readable alpha-numerical values for column names.

I want to extract entire email addresses from any column (cell) that has the @ symbol in it. How would I search the entire dataframe regardless of column for the @ symbol?

Input df:
    a.1   b.2        c.1      
    aa    a@a.com    12        
    bb    b@b.com    29       
    cc              
    dd    d@d.com              

example df I want post extraction:

a.1   b.2        c.1       email
aa    a@a.com    12        a@a.com
bb    b@b.com    29        b@b.com
cc              
dd    d@d.com              d@d.com

Answer 1

Using str.contains

df['email']=df.loc[df['b.2'].str.contains('@'),'b.2']

Seems like you need

df['email']=df[df.apply(lambda x : x.str.contains('@')).eq(True)].ffill(1).iloc[:,-1]