python - 在链接中查找日期实例；正则表达式； Python

Question

我有一个巨大的链接列表，大致遵循下一个结构:

http://www.website.com/2016/2/25/11118290/story
http://www.website.com/authors/author
http://www.website.com/2016/1/25/11118290/story
http://www.website.com/authors/author
http://www.website.com/2015/12/15/11118290/story
http://www.website.com/authors/author
http://www.website.com/2010/01/01/11118290/story
http://www.website.com/authors/author

我只需要获取包含日期的链接，即:

http://www.website.com/YYYY/MM/DD/11118290/story

但日期也可以是 YYYY/M/D 或 YYYY/MM/D 或 YYYY/M/DD

我无法弄清楚什么正则表达式只提取带有日期的链接，但日期格式略有可变。

Answer 1

使用标准库 (dateutil) 似乎对我有用:

test_set = [
'http://www.website.com/2016/2/25/11118290/story',
'http://www.website.com/authors/author',
'http://www.website.com/2016/1/25/11118290/story',
'http://www.website.com/authors/author',
'http://www.website.com/2015/12/15/11118290/story',
'http://www.website.com/authors/author',
'http://www.website.com/2010/01/01/11118290/story',
'http://www.website.com/2010/1/1/11118290/story',
'http://www.website.com/2010/01/1/11118290/story',
'http://www.website.com/authors/author',
]

from dateutil.parser import parse
for lnk in test_set:
    dt = lnk.replace("http://www.website.com/","").split("/")
    dt_str = "-".join(dt[:3])
    try:
        parse(dt_str)
        print("Date: %s"  % lnk)
    except ValueError:
        print("Not a date: %s" % lnk)


Date: http://www.website.com/2016/2/25/11118290/story
Not a date: http://www.website.com/authors/author
Date: http://www.website.com/2016/1/25/11118290/story
Not a date: http://www.website.com/authors/author
Date: http://www.website.com/2015/12/15/11118290/story
Not a date: http://www.website.com/authors/author
Date: http://www.website.com/2010/01/01/11118290/story
Date: http://www.website.com/2010/1/1/11118290/story
Date: http://www.website.com/2010/01/1/11118290/story
Not a date: http://www.website.com/authors/author