Regex - parsing string into groups

Question

I have specific log messages and I would like to parse it into groups. I would like to make an alternative version in case if my string is more specific.

My logs:

18:48:24:284 => [DEBUG] [xxx.yyy.zzz] [8] Message1
18:48:24:671 => [INFO] [uuu.www.aaa] [8] Method: 'ReturnType MethodName(MethodParameter)'. Line: ~30. Message2

I have written the following regex:

(?<timestamp>\d+:\d+:\d+:\d+.*)\s+=>\s+\[(?<level>\w+)\]\s+\[(?<emmiter>.*)\]\s+\[(?<thread>\d+)\]\s+(?<message>.*)

It parses these messages into specific groups:

timestamp: 18:48:24:284
level: DEBUG
emmiter: xxx.yyy.zzz
thread: 8
message: Message1

timestamp: 18:48:24:671
level: INFO
emmiter: uuu.www.aaa
thread: 8
message: Method: 'ReturnType MethodName(MethodParameter)'. Line: ~30. Message2

But right now I would like to add 2 more groups, in case if they exist: method and Line

So, I would like to get results like this:

timestamp: 18:48:24:284
level: DEBUG
emmiter: xxx.yyy.zzz
thread: 8
method:
line: 
message: Message1

timestamp: 18:48:24:671
level: INFO
emmiter: uuu.www.aaa
thread: 8
method: ReturnType MethodName(MethodParameter)
line: ~30
message: Message2

Can you please help me with that? Everything I do results in parsing only Line1 or only Line2 properly, but I would like to parse them both with one regex.

Which development environment / language are you using ? Please add appropriate tags to your question! Also, please provide the regex expression you have already written! — SQL Police
– SQL Police, Commented Jun 28, 2015 at 17:28
I'm using it in external application. I assume it's java. I have updated post with my current state of regex — Tomasz
– Tomasz, Commented Jun 28, 2015 at 17:29

Wiktor Stribiżew · Accepted Answer · 2015-06-28 17:45:03Z

2

I can suggest the following regular expression:

(?<timestamp>\d+:\d+:\d+:\d+.*)\s+=>\s+\[(?<level>\w+)\]\s+\[(?<emmiter>.*)\]\s+\[(?<thread>\d+)\](?:\s+Method:\s'(?<method>[^']*)'\s*\.)?(?:\s*Line:\s*(?<line>.+)\.)?\s*(?<message>.*)
                                                                                                                     ^^^^^^              ^                  ^^^^       ^

See demo here

I added 2 optional groups with non-capturing groups and a ? quantifier (?:...)? called methodand line.

I suggest using (?<method>[^']*) to capture all symbols other than ' to capture method name, and Line:\s*(?<line>.+)\. to capture line that is too greedy because I am not sure what text you might have there. You can actually adjust the (?<line>.+) part to some more restrictive pattern (I thought of ~?\d+ but no idea if you may have colons or anything else there).

edited Jun 28, 2015 at 17:45

answered Jun 28, 2015 at 17:39

Wiktor Stribiżew

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1 Comment

Wiktor Stribiżew Over a year ago

Please do not hesitate to ask for clarifications in case you have any doubts about this. I posted some considerations above in the answer.

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