在数据框列中剪切字符串，直到某些字符串但包括

Question

I have similar data as the following:

df = pd.DataFrame({'pagePath':['/my/retour/details/n8hWu7iWtuRXzSvDvCAUZRAlPda6LM/', 
                               '/my/orders/details/151726/', 
                               '/my/retours/retourmethod/']})
print(df)
                                            pagePath
0  /my/retour/details/n8hWu7iWtuRXzSvDvCAUZRAlPda...
1                         /my/orders/details/151726/
2                          /my/retours/retourmethod/

What I want to do is to cut the string until (but including) details

Expected output

                    pagePath
0  /my/retour/details/
1  /my/orders/details/
2  /my/retours/retourmethod/

The following works , but its slow

df['pagePath'] = np.where(df.pagePath.str.contains('details'),
                          df.pagePath.apply(lambda x: x[0:x.find('details')+8]), 
                          df.pagePath)

print(df)

                    pagePath
0        /my/retour/details/
1        /my/orders/details/
2  /my/retours/retourmethod/

I tried regex , but could only get it to work excluding :

df['pagePath'] = np.where(df.pagePath.str.contains('details'),
                          df.pagePath.str.extract('(.+?(?=details))'), 
                          df.pagePath)

print(df)
      pagePath
0  /my/retour/
1  /my/orders/
2          NaN

Plus the regex code returns NaN , when the row does not contain details

So I feel there's an easier and more elegant way for this. How would I write a regex code to solve my problem? Or is my solution already sufficient?

Answer 1

Would you like to try str.extract

('/'+df.pagePath.str.extract('/(.*)details')+'details')[0].fillna(df.pagePath)
Out[130]: 
0           /my/retour/details
1           /my/orders/details
2    /my/retours/retourmethod/
Name: 0, dtype: object

Answer 2

All you need to do is provide a fallback in the regex for when there is no 'details' :

>>> df.pagePath.str.extract('(.+?details/?|.*)')

                           0
0        /my/retour/details/
1        /my/orders/details/
2  /my/retours/retourmethod/