import re
mystring = "TeSt"
lowerresults = re.match("^[a-z]{4}$", mystring.lower())
print(lowerresults.group())
ignoreresults = re.match("^[a-z]{4}$", mystring, re.IGNORECASE)
print(ignoreresults.group())
aW1wb3J0IHJlCm15c3RyaW5nID0gIlRlU3QiCmxvd2VycmVzdWx0cyA9IHJlLm1hdGNoKCJeW2Etel17NH0kIiwgbXlzdHJpbmcubG93ZXIoKSkKcHJpbnQobG93ZXJyZXN1bHRzLmdyb3VwKCkpCmlnbm9yZXJlc3VsdHMgPSByZS5tYXRjaCgiXlthLXpdezR9JCIsIG15c3RyaW5nLCByZS5JR05PUkVDQVNFKQpwcmludChpZ25vcmVyZXN1bHRzLmdyb3VwKCkp