Took a suggestion from Andre Nathan (andre@digirati.com.br)

to change the behavior of Net::LDAP::Filter#method_missing
to allow case-insensitive attribute names.

lib/net/ldap/entry.rb

@@ -50,7 +50,7 @@ class LDAP
   # restrict the range of characters allowed in attribute names.
   # To simplify handling attribute names, Net::LDAP::Entry
   # internally converts them to a standard format. Therefore, the
-  # methods which take attribute names can take Strings or Synmbols,
+  # methods which take attribute names can take Strings or Symbols,
   # and work correctly regardless of case or capitalization.
   #
   # An attribute consists of zero or more data items called
@@ -140,7 +140,7 @@ class LDAP
     # arguments or a block...
     #
     def method_missing *args, &block # :nodoc:
-      s = args[0]
+      s = args[0].to_s.downcase.intern
       if attribute_names.include?(s)
         self[s]
       elsif s.to_s[-1] == 61 and s.to_s.length > 1

lib/net/ldap/filter.rb

@@ -272,8 +272,14 @@ class Filter
 
   # Converts an LDAP filter-string (in the prefix syntax specified in RFC-2254)
   # to a Net::LDAP::Filter.
-  def self.from_rfc2254 str
-    FilterParser.new(str).filter
+  def self.construct ldap_filter_string
+    FilterParser.new(ldap_filter_string).filter
+  end
+
+  # Synonym for #construct.
+  # to a Net::LDAP::Filter.
+  def self.from_rfc2254 ldap_filter_string
+    construct ldap_filter_string
   end
 
 end # class Net::LDAP::Filter