python - Check for letter after a substring -

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i'm trying find way check letter after sub-string. have searched both on internet , google. if sub-string is: sub, , text is: substrings cool, should return true , if text is: sub dafdgnjgf should return false.

if you're looking any valid letter after given sub-string, can first find position of sub-string inside string str.find, check if index after sub-string matches ascii_letters string:

from string import ascii_letters  sub = 'sub' s = 'substrings cool'

now, check can this, index string after @ position str.find(sub) + len(sub) i.e position after sub-string:

if s[s.find(sub) + len(sub)] in ascii_letters:     print(true) else:     print(false)

this prints true if sub followed letter, if not:

s = 'sub dafdgnjgf'

it prints false.


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