Python字符串操作--寻找所有匹配的位置

You said I was your life. Are you still alive when you lost it?

def find_all(string, sub):
    start = 0
    pos = []
    while True:
        start = string.find(sub, start)
        if start == -1:
            return pos
        pos.append(start)
        start += len(sub)


print(find_all('You said I was your life. Are you still alive when you lost it?', 'y'))

import re

string = 'You said I was your life. Are you still alive when you lost it?'
pattern = 'you'
for m in re.finditer(pattern, string):
    print(m.start(), m.end())