import re
s = "1991-02-28"
re.sub(r"(\d{4})-(\d{2})-(\d{2})", r'\1/\2/\3')
Out[6]: '1991/02/28'
import re
s = "1991-02-28"
re.sub(r"(\d{4})-(\d{2})-(\d{2})", r'\1/\2/\3')
Out[6]: '1991/02/28'
本文标题：【python-字符串/正则表达式】正则调整文本格式
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