How can I find content on the site and be notified when it is available?

Question

Notifications

Tell me, are there services that allow on a certain page of the site in automatic mode, reloading the page at certain intervals, to search for a specific text, and if it is found, send push or email notifications about the appearance of the desired text?
If not, how, in your opinion, could this be implemented on the client side (through the developer tools in the browser)?

Answer 1

https://chrome.google.com/webstore/detail/visualpi...
https://chrome.google.com/webstore/detail/page-mon...
or whatever?

Answer 2

1. Unfortunately, I do not know such services.
2. A very strange idea to do this on the client side. And in general, the client side for the user, why should he constantly reload the page ??? :-O
The usual parser, which is launched via cron, bypasses the necessary pages and performs certain actions. Moreover, if the location of this text is not important, then you can generally do it through regular expressions without parsing the DOM. It is done in any language, it rather depends on whether to run it on a working machine / your own server or on a shared hosting.

Answer 3

Yes, almost exactly what you need: a browser plugin that would send notifications when the page content changes. Ideally - so that you can specify a word or phrase to search for, and not just the fact that the content has changed.