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etc_search
In its simplest form, <txp:etc_search /> acts like the built-in Textpattern search, digging articles’ title and body. But it adds a bit of logic without recurring to match="all" or match="any" attribute.
This plugin is based on cbs_live_search, but adds enough new features to deserve a new name. It displays a search box similarly to <txp:search_input />. If Javascript is enabled, a results list will fade in and resize in real time below the search box with a nice animation effect as the user types his query. When the search box is empty, the results list shrinks and fades out. When the user hits the Enter key he gets redirected to a traditional search results page, so the plugin also degrades nicely in non-Javascript browsers.