1.
if (len(regex) > 2 and regex[0] == '(' and regex[-1] == ')' and
sum(regex.count(char) for char in splitter) == 1 and
regex.count('(') == 1 and regex.count(')') == 1):
print('hi')
2.
if (len(regex) > 2 and regex[0] == '(' and regex[-1] == ')' and
sum(regex.count(char) for char in splitter) == 1 and
regex.count('(') == 1 and regex.count(')') == 1):
print('hi')
3.
if (len(regex) > 2 and regex[0] == '(' and regex[-1] == ')'
and regex.count('(') > 1):
print('hi')