diff --git a/lib/i18n/config.rb b/lib/i18n/config.rb
index 9c4221c7..10645017 100644
--- a/lib/i18n/config.rb
+++ b/lib/i18n/config.rb
@@ -145,5 +145,21 @@ def enforce_available_locales
     def enforce_available_locales=(enforce_available_locales)
       @@enforce_available_locales = enforce_available_locales
     end
+
+    # Returns the current interpolation patterns. Defaults to
+    # I18n::DEFAULT_INTERPOLATION_PATTERNS.
+    def interpolation_patterns
+      @@interpolation_patterns ||= I18n::DEFAULT_INTERPOLATION_PATTERNS.dup
+    end
+
+    # Sets the current interpolation patterns. Used to set a interpolation
+    # patterns.
+    #
+    # E.g. using {{}} as a placeholder like "{{hello}}, world!":
+    #
+    #   I18n.config.interpolation_patterns << /\{\{(\w+)\}\}/
+    def interpolation_patterns=(interpolation_patterns)
+      @@interpolation_patterns = interpolation_patterns
+    end
   end
 end
diff --git a/lib/i18n/interpolate/ruby.rb b/lib/i18n/interpolate/ruby.rb
index d2fdda75..b5586b2a 100644
--- a/lib/i18n/interpolate/ruby.rb
+++ b/lib/i18n/interpolate/ruby.rb
@@ -2,11 +2,13 @@
 # http://github.com/mutoh/gettext/blob/f6566738b981fe0952548c421042ad1e0cdfb31e/lib/gettext/core_ext/string.rb
 
 module I18n
-  INTERPOLATION_PATTERN = Regexp.union(
+  DEFAULT_INTERPOLATION_PATTERNS = [
     /%%/,
     /%\{(\w+)\}/,                               # matches placeholders like "%{foo}"
     /%<(\w+)>(.*?\d*\.?\d*[bBdiouxXeEfgGcps])/  # matches placeholders like "%<foo>.d"
-  )
+  ].freeze
+  INTERPOLATION_PATTERN = Regexp.union(DEFAULT_INTERPOLATION_PATTERNS)
+  deprecate_constant :INTERPOLATION_PATTERN if method_defined? :INTERPOLATION_PATTERN
 
   class << self
     # Return String or raises MissingInterpolationArgument exception.
@@ -18,7 +20,7 @@ def interpolate(string, values)
     end
 
     def interpolate_hash(string, values)
-      string.gsub(INTERPOLATION_PATTERN) do |match|
+      string.gsub(Regexp.union(config.interpolation_patterns)) do |match|
         if match == '%%'
           '%'
         else
diff --git a/test/i18n/interpolate_test.rb b/test/i18n/interpolate_test.rb
index 78e54d3b..1180181f 100644
--- a/test/i18n/interpolate_test.rb
+++ b/test/i18n/interpolate_test.rb
@@ -89,3 +89,20 @@ def teardown
       I18n.interpolate("%{first} %{last}", :first => 'Masao')
   end
 end
+
+class I18nCustomInterpolationPatternTest < I18n::TestCase
+  def setup
+    super
+    @old_interpolation_patterns = I18n.config.interpolation_patterns
+    I18n.config.interpolation_patterns << /\{\{(\w+)\}\}/
+  end
+
+  def teardown
+    I18n.config.interpolation_patterns = @old_interpolation_patterns
+    super
+  end
+
+  test "String interpolation can use custom interpolation pattern" do
+    assert_equal "Masao Mutoh", I18n.interpolate("{{first}} {{last}}", :first => "Masao", :last => "Mutoh")
+  end
+end