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(&(&(&(& (mailnickname=*) (| (&(objectCategory=person)(objectClass=use
+r)(!(homeMDB=*))(!(msExchHomeServerName=*)))(&(objectCategory=person)
+(objectClass=user)(|(homeMDB=*)(msExchHomeServerName=*)))(&(objectCat
+egory=person)(objectClass=contact))(objectCategory=group)(objectCateg
+ory=publicFolder)(objectCategory=msExchDynamicDistributionList) )))(o
+bjectCategory=contact)(proxyAddresses=smtp:*example.com)))

(&
    (&
...
        (proxyAddresses=smtp:*example.com)
    )
)

#!/usr/bin/perl

...
    print_chunk(--$step,$parens,1) ;
  }
}