Regex for 500 erros in Apache log fails.

[pontus]

I've set up Zabbix active agent to monitor Apache logs for 50x error using the following item

logrt[/var/log/apache2/host.domain.com/access.log, 50\d ,,,skip]

This gives me matches for 50x errors but also for other things containing 500, such as request size.
The regexp, that do start and ends with space " 50\d " works as intended on regex101.com

The following line in the log file gets a match by Zabbix but shouldn't

192.168.1.47 - - [04/Sep/2024:07:09:23 +0200] "GET /some/path/to/some/file.extension HTTP/1.1" 200 4502 "-" "Some browser based on Alamofire/5.9.1"

Only this should give a match

192.168.1.47 - - [04/Sep/2024:07:09:23 +0200] "GET /some/path/to/some/file.extension HTTP/1.1" 500 4502 "-" "Some browser based on Alamofire/5.9.1"

Any advice is highly appreciated.

[cyber]

Put your regex in quotes in item parameters...

logrt[/var/log/apache2/host.domain.com/access.log," 50\d ",,,skip]