3.1.5.1.4 ANR Search Filter
When the client performs an ambiguous name resolution (ANR) search, it SHOULD use the following query.
This search query is specified in ABNF, as specified in [RFC5234].
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ANRFilter = "(&(mail=*)(|(mail=" <search-string> "*)(cn=" <search- string> "*)(sn=" <search-string> "*)(givenName=" <search-string> "*) (displayName=" <search-string> "*)))" search-string = <a user specified search string>