调整字符串日期的格式

import re


s = 'birthday is 1991-11-19'

res1 = re.sub('(d{4})-(d{2})-(d{2})',r'2/3/1',s)

res2 = re.sub('(?P<year>d{4})-(?P<month>d{2})-(?P<day>d{2})',r'g<month>/g<day>/g<year>',s)

print(res1)
print(res2)