Question

使用正则表达式，我想找出列表中的哪些元素，以样式（yyyy-mm-dd）结尾，例如（2016-05-04）等。

模式r'（2016- \ d \ d- \ d \ d）'看起来还算天真。将它与Endswith结合的正确方法是什么？

谢谢。

import re

a_list = ["Peter arrived on (2016-05-04)", "Building 4 floor (2020)", "Fox movie (2016-04-04)", "David 2016-08-", "Mary comes late(true)"]

style = r'\(2016\-\d\d\-\d\d\)'

for a in a_list:
    if a.endswith(style):
        print a

Answer 1

您不能将正则表达式与字符串操作结合使用。只需使用re.search查找匹配项，然后在模式中使用锚点$即可检查匹配项是否在末尾发生

>>> import re
>>> style = re.compile(r'\(2016-\d\d-\d\d\)$')
>>> for a in a_list:
...     if style.search(a):
...         print (a)
... 
Peter arrived on (2016-05-04)
Fox movie (2016-04-04)

Answer 2

使用r'$\d{4}-\d{2}-\d{2}$$'

例如：

import re

a_list = ["Peter arrived on (2016-05-04)", "Building 4 floor (2020)", "Fox movie (2016-04-04)", "David 2016-08-", "Mary comes late(true)"]

style = r'\(\d{4}-\d{2}-\d{2}\)$'

for a in a_list:
    if re.search(style, a):
        print a

输出：

Peter arrived on (2016-05-04)
Fox movie (2016-04-04)

Answer 3

应该是

.*\(2016\-\d{2}\-\d{2}\)$

$符号在末尾显示

Python，用于过滤元素的正则表达式以列表中的样式结尾

3 个答案: