Quote:
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not formats:"=EPUB" and formats:true
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I hand type searches most of the time (I do lots of content server searching where the tag browser isn't available) and it's worthwhile knowing that 1)the quotes aren't needed for one word searches, 2) the equals aren't needed except when trying to exclude inadvertent matches (not likely in the formats field) and the "and" isn't needed because it's the default Boolean search condition, so this will give the same results:
not formats:EPUB formats:true
As an aside, it's also worthwhile knowing the following special characters that can follow the colon or appear inside the quotes in a search:
= for exact matches only
< or > for numerical or date comparisons
# for counting is_multiple (number of formats or tags so formats:#1 finds books with a single format of any type)
~ for regular expressions
An example of the less well known "#" - this will find books that have only the text format and no others:
formats:TXT formats:#1