How to bulk replace a piece of text from several lines in multiple files?

Question

linux

Good afternoon.
The server hosts many sites with the same type of templates and .htaccess. There was a need to immediately change one block in the template on all sites and slightly correct .htaccess.
The problem is that you need to edit blocks with text on several lines.
How can I do this?

Answer 1

Basically, you can just do one monstrous replacement command with sed.

Answer 2

Unfortunately, it's best to use not bash, sed is great for a line in this regard, but full-fledged regular expressions with a line break, etc., are better to use php.

Answer 3

The problem is that you need to edit blocks with text on several lines.

For sed, this is not a problem, you just need to know it a little further than s///.