IS - look for exact match of the supplied test
value
LAST - End marker for the
BookQueryTest enumeration, not a valid query test.
REGEX_NORMAL - A regular expression
query against contact data normalized with util_utf8_normalize, the normalized data is lower case with any
accents removed.
REGEX_RAW - A regular expression query
against raw contact data, this is usually slower than a REGEX_NORMAL
as it implies that VCard(s) must be parsed in order to get the raw data for comparison.