Regex matching only second group

Question

Is there any way that just match the string of second group by just using regex?

The tool I'm using is Rundeck's Global Log Filters (Hightlight Output)

Tool description:

Regular Expression to test. Use groups to selectively highlight. More Use a non-grouped pattern to highlight entire match:

regex: test message: this is a test result: this is a test Use regex groups to only highlight grouped sections:

regex: this (is) a (test) result: this is a test See the Java Pattern documentation.

Example:

3)  Manager port: 2614
4)  Tcp Port: 2615
3)  Manager port: 2714
4)  Tcp Port: 2715

Above is the strings, I want to get the match of "3) Manager port: 2714" only. Here is what I come up (?:Manager port:.*){1}

But it still matching both 3) Manager port: 2614 and 3) Manager port: 2714

Thanks

Sure, [`[\s\S]*\KManager port:.*`](https://regex101.com/r/p4SKqY/1) — Wiktor Stribiżew, Oct 23 '17 at 20:04
@WiktorStribiżew Thank you so much. That's exactly what I need. — Jervis Lin, Oct 23 '17 at 20:07
If you want only the second line that starts with "3) Manager port: " you shouldn't use regex. a simple `String.startsWith()` would do the trick. — Nir Alfasi, Oct 23 '17 at 20:07
@JervisLin Are you sure it works in your target environment? Please check and let know. It is a PCRE/Onigmo/Boost/PyPi regex pattern only. — Wiktor Stribiżew, Oct 23 '17 at 20:10
@WiktorStribiżew Thanks for bringing that up. I just tested it and it didn't work on my environment. Mine is using Java pattern — Jervis Lin, Oct 23 '17 at 20:17
@JervisLin Please post the code or name of the tool you are using the pattern in. — Wiktor Stribiżew, Oct 23 '17 at 20:17
@alfasin I use rundeck's function log filter, which requires regex for the job — Jervis Lin, Oct 23 '17 at 20:18
@WiktorStribiżew I've update my question to include the tool I'm using — Jervis Lin, Oct 23 '17 at 20:23
So, you need `[\s\S]*(Manager port:.*)` or `(?s:.*)(Manager port:.*)` — Wiktor Stribiżew, Oct 23 '17 at 20:26

score 1 · Accepted Answer · answered Oct 23 '17 at 20:29

1

The (?:Manager port:.*){1} is equal to Manager port:.* and just matches any Manager: substring and the rest of the line.

With a java.util.regex regex library, you may use

[\s\S]*(Manager port:.*)

See the regex demo

Details

[\s\S]* - any 0+ chars as many as possible (note that [\s\S] is a "hack", you may safely use (?s:.*) to do the same thing as (?s:.*) represents a modifier group with a DOTALL modifier turned on and thus . matches any char including line break chars)
( - Capturing group start
Manager port: - a literal substring
.* - 0+ chars other than line break chars, as many as possible.
) - capturing group end.

answered Oct 23 '17 at 20:29

Wiktor Stribiżew

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For some reasons, it still highlights both records in Rudeck. Not really sure the root cause of it – Jervis Lin Oct 23 '17 at 20:45
just put up the link to Question – Jervis Lin Oct 23 '17 at 20:59
@JervisLin No idea, really. It must be a bug, because the docs say this must work. Are you using the latest build? There was some update 10 days ago. – Wiktor Stribiżew Oct 23 '17 at 21:35
get a reply from Rundeck support mentioned **the Highlight Output Global Log Filter is applied “per line”, that is , it cannot filter multi line patterns**. I will take this as an answer since it works the way as described in the question. – Jervis Lin Oct 25 '17 at 19:25

Regex matching only second group

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