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-rw-r--r--activesupport/lib/active_support/core_ext/string/multibyte.rb7
1 files changed, 7 insertions, 0 deletions
diff --git a/activesupport/lib/active_support/core_ext/string/multibyte.rb b/activesupport/lib/active_support/core_ext/string/multibyte.rb
index 2eedd4fdb1..57d7f8d1e7 100644
--- a/activesupport/lib/active_support/core_ext/string/multibyte.rb
+++ b/activesupport/lib/active_support/core_ext/string/multibyte.rb
@@ -35,6 +35,13 @@ class String
ActiveSupport::Multibyte.proxy_class.new(self)
end
+ # Return +true+ if string has utf_8 encoding.
+ #
+ # utf_8_str = "some string".encode "UTF-8"
+ # iso_str = "some string".encode "ISO-8859-1"
+ #
+ # utf_8_str.is_utf8? # => true
+ # iso_str.is_utf8? # => false
def is_utf8?
case encoding
when Encoding::UTF_8