import re


state_names=['Alabama','Alaska','Arizona','Arkansas','California','Colorado','Connecticut','Delaware','Florida','Georgia','Hawaii','Idaho','Illinois','Indiana','Iowa','Kansas','Kentucky','Louisiana','Maine','Maryland','Massachusetts','Michigan','Minnesota','Mississippi','Missouri','Montana','Nebraska','Nevada','New Hampshire','NewJersey','NewMexico','NewYork','NorthCarolina','NorthDakota','Ohio','Oklahoma','Oregon','Pennsylvania','RhodeIsland','SouthCarolina','SouthDakota','Tennessee','Texas','Utah','Vermont','Virginia','Washington','WestVirginia','Wisconsin','Wyoming']

a = str(state_names)
b=re.findall('^M', a)

print(b)

state_names를 문자열로 바꾸고, 그 문자열 중 M으로 시작하는 문자들을 모두 출력하고 싶은데 이렇게 작성하면 []만 출력됩니다. 뭐가 잘못된 걸까요?