正则表达式从列表中筛选日期

您可以首先检查是否有与字符串匹配的正则表达式:

result = []
rx = re.compile(r'(\d+)-(\d+)-(\d+)')
for i in my_list:
    if rx.search(i):                          # Check if the regex matches the string
        result.append(rx.sub(r"\3-\1-\2", i)) # Add modified string to resulting list

看到了吗 Python demo . 输出:

['31-2022-03', '31-2021-03']

你可以这样写:

rx = re.compile(r'(\d+)-(\d+)-(\d+)')
my_list = [rx.sub(r"\3-\1-\2", i) for i in my_list if rx.search(i)]