((p "A search operator specifies how the comparison of a search value and a zettel should be executed." " " "Every comparison is done case-insensitive, treating all uppercase letters the same as lowercase letters.") (p "The following are allowed search operator characters:") (ul (li "The exclamation mark character (" (@L (@H "&ldquo;") (kbd "!") (@H "&rdquo;")) ", U+0021) negates the meaning.") (li "The equal sign character (" (@L (@H "&ldquo;") (kbd "=") (@H "&rdquo;")) ", U+003D) compares on equal content (" (@L (@H "&ldquo;") "equals operator" (@H "&rdquo;")) ").") (li "The tilde character (" (@L (@H "&ldquo;") (kbd "~") (@H "&rdquo;")) ", U+007E) compares on matching (" (@L (@H "&ldquo;") "match operator" (@H "&rdquo;")) ").") (li "The left square bracket character (" (@L (@H "&ldquo;") (kbd "[") (@H "&rdquo;")) ", U+005B) matches if there is some prefix (" (@L (@H "&ldquo;") "prefix operator" (@H "&rdquo;")) ").") (li "The right square bracket character (" (@L (@H "&ldquo;") (kbd "]") (@H "&rdquo;")) ", U+005D) compares a suffix relationship (" (@L (@H "&ldquo;") "suffix operator" (@H "&rdquo;")) ").") (li "The colon character (" (@L (@H "&ldquo;") (kbd ":") (@H "&rdquo;")) ", U+003A) compares depending on the on the actual " (a (@ (href . "00001006030000")) "key type") " (" (@L (@H "&ldquo;") "has operator" (@H "&rdquo;")) ")." " " "In most cases, it acts as a equals operator, but for some type it acts as the match operator.") (li "The less-than sign character (" (@L (@H "&ldquo;") (kbd "<") (@H "&rdquo;")) ", U+003C) matches if the search value is somehow less then the metadata value (" (@L (@H "&ldquo;") "less operator" (@H "&rdquo;")) ").") (li "The greater-than sign character (" (@L (@H "&ldquo;") (kbd ">") (@H "&rdquo;")) ", U+003E) matches if the search value is somehow greater then the metadata value (" (@L (@H "&ldquo;") "greater operator" (@H "&rdquo;")) ").") (li "The question mark (" (@L (@H "&ldquo;") (kbd "?") (@H "&rdquo;")) ", U+003F) checks for an existing metadata key (" (@L (@H "&ldquo;") "exist operator" (@H "&rdquo;")) ")." " " "In this case no " (a (@ (href . "00001007706000")) "search value") " must be given.")) (p "Since the exclamation mark character can be combined with the other, there are 18 possible combinations:") (ol (li (@L (@H "&ldquo;") (kbd "!") (@H "&rdquo;")) ": is an abbreviation of the " (@L (@H "&ldquo;") (kbd "!~") (@H "&rdquo;")) " operator.") (li (@L (@H "&ldquo;") (kbd "~") (@H "&rdquo;")) ": is successful if the search value matched the value to be compared.") (li (@L (@H "&ldquo;") (kbd "!~") (@H "&rdquo;")) ": is successful if the search value does not match the value to be compared.") (li (@L (@H "&ldquo;") (kbd "=") (@H "&rdquo;")) ": is successful if the search value is equal to one word of the value to be compared.") (li (@L (@H "&ldquo;") (kbd "!=") (@H "&rdquo;")) ": is successful if the search value is not equal to any word of the value to be compared.") (li (@L (@H "&ldquo;") (kbd "[") (@H "&rdquo;")) ": is successful if the search value is a prefix of the value to be compared.") (li (@L (@H "&ldquo;") (kbd "![") (@H "&rdquo;")) ": is successful if the search value is not a prefix of the value to be compared.") (li (@L (@H "&ldquo;") (kbd "]") (@H "&rdquo;")) ": is successful if the search value is a suffix of the value to be compared.") (li (@L (@H "&ldquo;") (kbd "!]") (@H "&rdquo;")) ": is successful if the search value is not a suffix of the value to be compared.") (li (@L (@H "&ldquo;") (kbd ":") (@H "&rdquo;")) ": is successful if the search value is has/match one word of the value to be compared.") (li (@L (@H "&ldquo;") (kbd "!:") (@H "&rdquo;")) ": is successful if the search value is not match/has to any word of the value to be compared.") (li (@L (@H "&ldquo;") (kbd "<") (@H "&rdquo;")) ": is successful if the search value is less than the value to be compared.") (li (@L (@H "&ldquo;") (kbd "!<") (@H "&rdquo;")) ": is successful if the search value is not less than, e.g. greater or equal than the value to be compared.") (li (@L (@H "&ldquo;") (kbd ">") (@H "&rdquo;")) ": is successful if the search value is greater than the value to be compared.") (li (@L (@H "&ldquo;") (kbd "!>") (@H "&rdquo;")) ": is successful if the search value is not greater than, e.g. less or equal than the value to be compared.") (li (@L (@H "&ldquo;") (kbd "?") (@H "&rdquo;")) ": is successful if the metadata contains the given key.") (li (@L (@H "&ldquo;") (kbd "!?") (@H "&rdquo;")) ": is successful if the metadata does not contain the given key.") (li (@L (@H "&ldquo;") (kbd "") (@H "&rdquo;")) ": a missing search operator can only occur for a full-text search." " " "It is equal to the " (@L (@H "&ldquo;") (kbd "~") (@H "&rdquo;")) " operator.")))