The search is performed via fuse.js.1 For the search keywords, white spaces act as the AND operator, and | acts as the OR operator. To match an exact phrase, double quote it. For example, R Markdown matches articles that contain both R and Markdown, R | Markdown matches articles that contain R or Markdown, and "R Markdown" matches articles that contain the whole phrase R Markdown.
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If you are not satisfied by the search, you may use alternative search engines such as Google or DuckDuckGo, and add the filter
site:yihui.orgafter your keywords, e.g.,R Markdown site:yihui.org. ↩︎