This PR adds the `check_output_matches` plugin, which can be used to count regexp or substring matches from either text files or command outputs and determine the final status based on the amount of matches that were found.
Reviewed-on: #5
Co-authored-by: Emmanuel BENOÎT <tseeker@nocternity.net>
Co-committed-by: Emmanuel BENOÎT <tseeker@nocternity.net>
