Is it somehow possible to have different search patterns per window or buffer, ie. I want to search for term A in window/buffer A and term B in window/buffer B so that using hlsearch, highlights different things in e.g. a split in parallel.
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You can use :autocmds to switch the current search pattern (register /) as you move along windows and buffers, but Vim will never highlight different patterns at the same time, as this still is a single global register, just being multiplexed.
Apart from searching, you can highlight different patterns (also with different colors) via the built-in :match, :2match, :3match, and :call matchadd(). These are window-local.
Finally, there are plugins like my Mark plugin that offer highlighting, searching, jumping to next match (similar to the built-in search), for multiple patterns. (The plugin page has links to alternative plugins.)
