使用正则表达式从字符串中提取时间戳

Question

我有以下字符串:

File Modification Date/Time     : 2018:03:05 15:21:35-04:00

并且,想分别提取这部分2018:03:05和这部分15:21:35.

我认为正则表达式会起作用吗？但是,不知道如何去做.

谢谢.

Answer 1

或许,re.findall:

>>> re.findall(r'\d+(?::\d+){2}', text)
['2018:03:05', '15:21:35']

细节

\d+    # one or more digits (for the first part of your expression)
(?:    # non-capture group 
:      # literal colon
\d+    
)
{2}    # specify exactly two repetitions for the group defined before