I would like to be able browse the web and have my browser (plus addon) automatically record any text that matches a given pattern (e.g. regular expression) along, optionally, with the URL it appeared on and a timestamp.
This would function like an automatic journal of pattern-matched strings during a day of browsing.
Examples of classes of pattern:
(I realise that there are a number of browser addons to search in-page and on command using regular expressions, and separately there are crawling and browser automation addons, but nothing to do automatic journalling.)
Thanks for any thoughts!