import re
missing_close = re.compile(r'\([^()]*\)|\[[^][]*]|\{[^{}]*}|(\w+[])}]|[([{]\w+)')
sen = "It is (fine [day]"
res_close = missing_close.finditer(sen)
for i in res_close:
    if i.group(1):
    	print(i.group(1))