Enhancement: Add regex support for HTTP(s) Json query or HTTP(s) Keyword monitors

When using the "HTTP(s) Json query" or "HTTP(s) keyword" monitors it would be great if there were a regex option when comparing the results.
I have an API that only returns an ISO time string like "2025-12-20T22:10:33:432Z" inside a Json block. The usual comparisons like "=" and ">" don't really work here. Right now I use a keyword search for "2025", but this will break in a few days on New Year 😉

Look for the HTTP(s) Json query and keyword monitor implementations in the codebase, likely in a directory like 'monitors' or 'checks'. Identify where the comparison logic (like '=' and '>') is defined. Add regex parsing and matching support there, ensuring it integrates with the existing configuration. Test by creating a monitor that uses regex on a sample ISO time string.

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