How can I remove the all lowercase letters before and after "Johnson" in these strings?

str1 = 'aBcdJohnsonzZz'
str2 = 'asdVJohnsonkkk'

Expected results are as below:

str1 = 'BJohnsonZ'
str2 = 'VJohnson'

You can partition the string, check it had the separator, than translate out lowercase letters, eg:

from string import ascii_lowercase as alcstr1 = 'aBcdJohnsonzZz'
p1, sep, p2 = str1.partition('Johnson')
if sep:str1 = p1.translate(None, alc) + sep + p2.translate(None, alc)
print str1