4.5 Comparators

gnu libsieve supports the following built-in comparators:

i;octet

This comparator simply compares the two arguments octet by octet

i;ascii-casemap

It treats uppercase and lowercase characters in the ascii subset of utf-8 as the same. This is the default comparator.

i;ascii-numeric

Treats the two arguments as ascii representation of decimal numbers and compares their numeric values. This comparator must be explicitly required prior to use.