It caused failures on CentOS 7 and FreeBSDs 12 and 13.
unknown file: Failure
C++ exception with description "regex_error" thrown in the test body.
[ FAILED ] CtrlChannelDhcpv4SrvTest.statusGet (3 ms)https://jenkins.aws.isc.org/job/kea-dev/job/ut-basic/1018/
Closes #2402 (closed).