import re
text = '[[aaa / bbb (T1=T2)] / [bbb (T1=T2) / bbb (T1>T2)]]'
pattern = r"\[([^][]*)]"
res = []
for s in re.findall(pattern, text):
res += re.split(r"\s+/\s+", s)
print(res)
aW1wb3J0IHJlCgp0ZXh0ID0gJ1tbYWFhIC8gYmJiIChUMT1UMildIC8gW2JiYiAoVDE9VDIpIC8gYmJiIChUMT5UMildXScKcGF0dGVybiA9IHIiXFsoW15dW10qKV0iCnJlcyA9IFtdCgpmb3IgcyBpbiByZS5maW5kYWxsKHBhdHRlcm4sIHRleHQpOgogICAgcmVzICs9IHJlLnNwbGl0KHIiXHMrL1xzKyIsIHMpCgpwcmludChyZXMp