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A related question about searching:
What do the equals sign and quotes that calibre adds to searches do?
For example, if you use the category browser to show only epub books, it inserts the following string into the search box: formats:"=EPUB"
Are those equals signs and quotes ever necessary when you're manually entering a search?
Also, does the singular and plural version of the operators the category browser adds to the search box always work? (The category browser adds plural versions of "authors" and "formats", but "author" and "format" seem to work, too.)
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