regex_specialchars.py

import re

#Special chars: () [] {} \ | . * + ? ^

sentence =  '''Sometimes, it is useful to find not just the 
first match in a sentence, but every match; the findIter() 
method returns an iterator containing every valid match.'''

pattern = re.compile(r'findIter()')

for match in re.finditer(pattern, sentence):
    print(match)