pandas show column with regular expression

1S=pd.Series(['Finland','Colombia','Florida','Japan','Puerto Rico','Russia','france'])
2S.str.contains('^F.*')
3

1import numpy as np
2df['first_five_Letter']=df['Country (region)'].str.extract(r'(^\w{5})')
3df.head()
4

1# Total items starting with F
2S.str.count(r'(^F.*)').sum()
3

1S=pd.Series(['Finland','Colombia','Florida','Japan','Puerto Rico','Russia','france'])
2[itm[0] for itm in S.str.findall('^[Ff].*') if len(itm)>0]
3

1df[df['Country (region)'].str.count('^[pP].*')>0]
2

1# Get countries starting with letter P
2S=pd.Series(['Finland','Colombia','Florida','Japan','Puerto Rico','Russia','france'])
3S[S.str.match(r'(^P.*)')==True]
4