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@@ -277,11 +277,14 @@ module ActiveSupport
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     # NameError is raised when the name is not in CamelCase or the constant is
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     # unknown.
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     def constantize(camel_cased_word)
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-      unless /\A(?:::)?([A-Z]\w*(?:::[A-Z]\w*)*)\z/ =~ camel_cased_word
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-        raise NameError, "#{camel_cased_word.inspect} is not a valid constant name!"
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-      end
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+      names = camel_cased_word.split('::')
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+      names.shift if names.empty? || names.first.empty?
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-      Object.module_eval("::#{$1}", __FILE__, __LINE__)
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+      constant = Object
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+      names.each do |name|
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+        constant = constant.const_defined?(name) ? constant.const_get(name) : constant.const_missing(name)
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+      end
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+      constant
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     end
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     # Turns a number into an ordinal string used to denote the position in an