Criterion constructor function to be combined in a custom search statement

Criterion constructor function to be combined in a custom search statement

before(date_char, negate = FALSE)

Arguments

date_char	A character string with format "DD-Mon-YYYY", e.g. "01-Apr-2019". We opt not to use Date or POSIX* like objects, since IMAP servers use this unusual date format.
negate	If TRUE, negates the search and seeks for "NOT SEARCH CRITERIA". Default is FALSE.

Value

A search string to be used as a request parameter in ImapCon$search() function.

See also

Other custom search: AND(), ImapCon, OR(), flag(), larger_than(), older_than(), on(), sent_before(), sent_on(), sent_since(), since(), smaller_than(), string(), younger_than()

Examples

if (FALSE) {
# select folder & search
con$select_folder(name = "INBOX")
# search for messages BEFORE "17-Apr-2019" AND NOT SMALLER than 512KB.
res <- con$search(request = AND(before(date_char = "17-Apr-2019"),
                                smaller_than(size = 512000, negate = TRUE)))
}