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User’s Manual LDAP

143

Using the Boolean operators and a prefix notation, the basic filters can

be combined to form more complex ones. The ‘&’ character represents

AND, the ‘|’ character represents OR and the ‘!’ character represents

NOT. Here are some examples that explain how to do that:

Note:

(sn=*smith) Surnames ending

with “smith”.

(sn=s*mi*th) Surnames

starting with “s”,

containing “mi”

and ending with

“th”.

Greater

than or

equal

(<attr>>=<value>) (sn>=Smith) Surnames

lexicographically

greater than or

equal to Smith.

Less or

equal than

(<attr><=<value>) (sn<=Smith) Surnames

lexicographically

less than or

equal to Smith.

Presence (<attr>=*) (sn=*) All surnames.

Filter Type Format Example Matches

AND (&(<filter1>

)(<filter2>)

...)

(&(sn=smith)

(objectclass

=person))

Entries with an object

class of person and a

surname exactly equal to

Smith.

OR (|(<filter1>

)(<filter2>)

...)

(|(sn=smith)

(cn=*smith))

Entries with a surname

exactly equal to Smith or a

commonname ending in

“smith”.

NOT (!(<filter>)

)

(!(mail=*)) Entries without a mail

attribute.

It is wise to create filters that sort out unwanted entries based on their object class. For

example, in an address book, you might only want to retrieve entries of the “people” class,

with the common name “John”, leaving out computers called John. This could be achieved

with the following filter: (&(objectclass=person)(cn=john))

Filter Type Format Example Matches

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