1 files changed, 7 insertions, 2 deletions
diff --git a/activesupport/lib/active_support/number_helper/number_to_delimited_converter.rb b/activesupport/lib/active_support/number_helper/number_to_delimited_converter.rb
index d85cc086d7..45ae8f1a93 100644
--- a/activesupport/lib/active_support/number_helper/number_to_delimited_converter.rb
+++ b/activesupport/lib/active_support/number_helper/number_to_delimited_converter.rb
@@ -3,7 +3,7 @@ module ActiveSupport
     class NumberToDelimitedConverter < NumberConverter #:nodoc:
       self.validate_float = true
 
-      DELIMITED_REGEX = /(\d)(?=(\d\d\d)+(?!\d))/
+      DEFAULT_DELIMITER_REGEX = /(\d)(?=(\d\d\d)+(?!\d))/
 
       def convert
         parts.join(options[:separator])
@@ -13,11 +13,16 @@ module ActiveSupport
 
         def parts
           left, right = number.to_s.split('.')
-          left.gsub!(DELIMITED_REGEX) do |digit_to_delimit|
+          left.gsub!(delimiter_pattern) do |digit_to_delimit|
             "#{digit_to_delimit}#{options[:delimiter]}"
           end
           [left, right].compact
         end
+
+        def delimiter_pattern
+          options.fetch(:delimiter_pattern, DEFAULT_DELIMITER_REGEX)
+        end
+
     end
   end
 end