Hi Guys i want to change index of my dataframe based on result of str.contains.

a quick example

```
import pandas as pd

df= pd.DataFrame({'Product':['Banana_1','Banana_2','Orange_a','Orange_b'],
    'Value':[5.10,5.00,2.10,2.00]})

df2 = df[df['Product'].str.contains('Banana')]

print(df2)

```

is there a way to use df2 filter to change df1 index?

Thanks