Escaping them with a backslash (within double quotes the backslash is meaningful and must be escaped, so two of them) should work: 

$ldap->search(
    base   => $ldapbase,
    scope  => "sub",
    filter => "(cn= John Wyner \\(DRAFT\\))"
);

[download]
perl -le'print map{pack c,($-++?1:13)+ord}split//,ESEL'

In reply to Re: LDAP. Parantheses present in the filter cn value by shmem
in thread LDAP. Parantheses present in the filter cn value by srini.here

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