How to match strings of only a specific length of characters in regex? (Python)

Question

I'm using

\[(.*?)\]|Response code (?P<code>\d+)

to search these fields:

[2018-01-20 05:19:54.812] INFO    com.mulesoft.ch.monitoring.MonitoringCoreExtension [qtp689806602-32]: Monitoring enabled: true
[2018-01-20 05:19:54.813] INFO    com.mulesoft.ch.monitoring.MonitoringCoreExtension [qtp689806602-32]: Registering ping flow injector...
[2018-01-20 05:19:54.833] INFO    com.mulesoft.ch.queue.boot.PersistentQueueCoreExtension [qtp689806602-32]: The PersistentQueueManager is NOT configured. The normal VM queue manager will be used.
[2018-01-20 05:19:54.841] INFO    org.mule.lifecycle.AbstractLifecycleManager [qtp689806602-32]: Initialising RegistryBroker
[2018-01-20 05:19:54.872] INFO
[2018-01-24 02:14:30.153] INFO    org.mule.routing.SynchronousUntilSuccessfulProcessingStrategy [[swt-fastsalescomp-anaplan-schedules].ScatterGatherWorkManager.24]: Exception thrown inside until-successful org.mule.module.http.internal.request.ResponseValidatorException: Response code 503 mapped as failure.

But I only want it to match the dates, not the other stuff that's between brackets as well as assign a named group 'code'(that parts working). I tried several variations including

\[(\d*?)\]
\[(\W*?)\]
\[^(\.*?){23}$\]

But I can't seem to get it to find anything with those criteria.

Bonus: I might be able to figure this one out once the rest is solved, but I might as well ask while I'm in here. How do I update a dictionary with the date and code as a key value pair?

@WiktorStribiżew you can add a ^ for the first part of your regex to impose that it starts at the beginning of the line for the timestamp!!! otherwise great as usual ;-)' — Allan
– Allan, Commented Feb 12, 2018 at 0:30

Srdjan M. · Accepted Answer · 2018-02-12 00:50:16Z

1

Regex: \d{4}(?:-\d{2}){2}[^]]+|(?<=Response code )(?P<code>\d+)

Details:

(?:) Non-capturing group
{n} Matches exactly n times
[^] Named Capture Group
| Or
(?<=) Positive Lookbehind
(?P<>) Named Capture Group

Python code:

for match in re.finditer(r'\d{4}(?:-\d{2}){2}[^]]+|(?<=Response code )(?P<code>\d+)', text):
    print(match.group())

Output:

2018-01-20 05:19:54.812
2018-01-20 05:19:54.813
2018-01-20 05:19:54.833
2018-01-20 05:19:54.841
2018-01-20 05:19:54.872
2018-01-24 02:14:30.153
503

Code demo

edited Feb 12, 2018 at 0:50

answered Feb 12, 2018 at 0:37

Srdjan M.

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4 Comments

Cdhippen Over a year ago

As a followup, how would I only return time values that have a 503 with them?

Srdjan M. Over a year ago

@Cdhippen You mean 02:14:30.153?

Cdhippen Over a year ago

Yes. My log has literal thousands of time entries, I'm trying to pull out only lines with time and a status code.

Cdhippen Over a year ago

changed it to this: pastebin.com/9wNsiU6u and now I have exactly what I want (I don't need the milliseconds, that will just complicate things since I'm going to try and put it in matplotlib) Thanks a ton for the help!

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