From c5c08c6499a00abff779b09a2fc0123f7568db1b Mon Sep 17 00:00:00 2001
From: Rob <phorque@gmail.com>
Date: Thu, 16 Oct 2014 12:24:32 +0100
Subject: mention the :without option [ci skip]

As pointed out in the ActiveModel::Validations::HelperMethods #validates_format_of documentation.
---
 guides/source/active_record_validations.md | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/guides/source/active_record_validations.md b/guides/source/active_record_validations.md
index 4dc7203ba3..cba4b852a1 100644
--- a/guides/source/active_record_validations.md
+++ b/guides/source/active_record_validations.md
@@ -361,6 +361,8 @@ class Product < ActiveRecord::Base
 end
 ```
 
+Alternatively, you can require that the specified attribute does _not_ match the regular expression by using the `:without` option.
+
 The default error message is _"is invalid"_.
 
 ### `inclusion`
-- 
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