Hardening/harness errors under valgrind

### Description
Made the harness and valgrind tests a little easier on the eye.
Fixed a few errors in harness tests.

Not sure if we should leave this so open... E.g. if the statistics takes 1000 seconds, it is a problem that we should research, but it would match `\d+`.

What about something in the middle? I mean, not so coarse to 1-2 seconds, but probabley 1-10. I think the following will do the trick:

`REGEX(\d)`