SIEVE filters: Support regex extension #1043
Currently the SIEVE filters frontend does not support the creation of regex filters.
Both the very old Avelsieve plugin for Squirrelmail and Roundcube already support regex filters.
The current specification for the filters themselves is at https://tools.ietf.org/html/draft-ietf-sieve-regex-01
There are several Sieve implementations that support this extensions, including Cyrus Sieve and Pigeonhole for Dovecot.
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