The Advanced Content Filter addon enables users to collapse posts in their network stream according to customized rules based on the raw item data.
A few real life examples
1. Collapse all posts containing at least an image
body matches "/\\[img/"
Pictures are nice, I'm fine to see them after a click to save space in my stream. I wrote the regular expression pattern without the closing bracket, because some the image tag can be used on its own [img] or with a dimension parameter [img=480x640].
2. Collapse reshares by specific contacts
author_link matches "/<name>/" && body matches "/\\[share author=/"
This rule combines two conditions with the logical operator AND - this means that the second condition will only be evaluated if the first one is true. With author_link the rule checks for users with the string cat_alina in their profile URL and if it happens, then the second part will check the item body for the string [share author= which appears only in reshared items.
3. Collapse posts from inoffiziell or unofficial news accounts
author_name matches "/[ui]noffi(ziell|cial)/i" || body matches "/\\[share author=.*[ui]noffi(cial|ziell)/i"
I want to filter all those news pages and luckily a lot of them contain the word inoffiziell or unofficial in their display name. So I search for (inoffiziell|unofficial) in the author display name OR (logical or) for (inoffiziell|unofficial) as attribute in [share author= to also catch reshared items. My regular expression [ui]noffi(ziell|cial) is a shorter version of (inoffiziell|unofficial) and the i after the second backslash indicates the pattern is case insensitive, which means it will match Inoffiziell or even UNOFFICIAL.
4. Collapse all posts not from a specific account
author_link != 'https://friendica.example.tld/profile/username' && body matches "/blubb/"
This rule matches items that have the word blubb in their body and which were not published by the profile https://friendica.example.tld/profile/username. Remember that equality operators == and != match the exact string against the provided item property, while matches that can match a portion of the item property.