echo-regexp: add tests #851

Job	Run time
container-test (ubuntu:latest)	10m 35s
fresh-macos-test (macos-14)	25m 16s
container-test (fedora:latest)	11m 2s
fresh-macos-test (macos-12)	29m 11s
container-test (debian:latest)	10m 40s
container-test (alpine:latest)	11m 35s
login-shells-and-linting	5m 45s
container-test (opensuse/leap)	12m 46s
runner-test (ubuntu-24.04)	11m 32s
container-test (opensuse/tumbleweed)	11m 8s
runner-test (ubuntu-22.04)	12m 16s
container-test (kalilinux/kali-rolling)	11m 22s
runner-test (macos-14)	21m 47s
runner-test (macos-12)	26m 42s
	3h 31m 37s

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