python regular expression for timestamp in log file-CodePudding

I got log file:

[2022-02-21 11:23:56.919] text text text text text text text text
[2022-02-21 11:23:58.868] text text text text text text text text
[2022-02-21 11:23:58.923] text text text text text text text text

Does anybody know how to get a regular expression for timestamps only?

CodePudding user response：

You can use Regex101 to test your patterns.

Try this one: \[(. )\]

CodePudding user response：

You don't really need re for this because the timestamp is fixed width. If you insist on using a regular expression then:

import re

t = '[2022-02-21 11:23:56.919] text text text text text text text text'

if (m := re.search(r'\d{4}-\d{2}-\d{2}\s\d{2}:\d{2}:\d{2}\.\d{3}', t)):
    print(m[0])

...or...

if (m := re.search(r'\[(. )\]', t)):
    print(m[0][1:-1])

Output:

2022-02-21 11:23:56.919

However:

print(t[1:24])

...would give the same result