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))
aW1wb3J0IHJlCm1pc3NpbmdfY2xvc2UgPSByZS5jb21waWxlKHInXChbXigpXSpcKXxcW1teXVtdKl18XHtbXnt9XSp9fChcdytbXSl9XXxbKFt7XVx3KyknKQpzZW4gPSAiSXQgaXMgKGZpbmUgW2RheV0iCnJlc19jbG9zZSA9IG1pc3NpbmdfY2xvc2UuZmluZGl0ZXIoc2VuKQpmb3IgaSBpbiByZXNfY2xvc2U6CiAgICBpZiBpLmdyb3VwKDEpOgogICAgCXByaW50KGkuZ3JvdXAoMSkp