Imexpire folder patterns

folder patterns
Folder patterns can be specified using POSIX regular expressions, if the  attribute    is set to. If the  attribute is not set (the default), IMAP expressions will be used. The format is that the folder pattern must start with, followed by a pattern. folder pattern examples shows the both formats of folder pattern for various folders.

See also:
 * folderpattern Option
 * imexpire and localized mailbox names
 * store.expirerule file rulesets
 * Message expiration