A great selection of incremental search (isearch) tips on /r/emacs:
miniblog.
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I'm increasingly treating terminal sessions as short lived: starting a fresh terminal tab keeps scrollback short and easy to search.
I'd love to have a terminal emulator that allows me to skip over output of specific verbose commands when searching.
I've been working on a search tool for a website with 9K items and a dumb implementation works just fine. I'd normally gravitate to a library or tool like elasticsearch (ES).
Adding custom filters etc is trivial on handrolled code. I wonder what scale requires actual search infra like ES.
One advantage I've come to appreciate about Dash/Zeal docsets: it's really nice having focused search.
The text search is constrained to the languages I care about enough to download the docset, substantially increasing the relevance. In Google I'd need to specify the language.