devise

https://github.com/plataformatec/devise

Ruby

Flexible authentication solution for Rails with Warden.

Mail::Multibyte::Chars#rindex

Returns the position _needle_ in the string, counting in
codepoints, searching backward from _offset_ or the end of the
string. Returns +nil+ if _needle_ isn't found.

Example:
  Mail::Multibyte.mb_chars('Café périferôl').rindex('é')   # => 6
  Mail::Multibyte.mb_chars('Café périferôl').rindex(/\w/u) # => 13

Source | Google | Stack overflow

Edit

git clone [email protected]:plataformatec/devise.git
cd devise
open

Contribute

# Make a new branch

git checkout -b -your-name--update-docs-Mail--Multibyte--Chars-rindex-for-pr

# Commit to git

git add git commit -m "better docs for Mail::Multibyte::Chars#rindex"

# Open pull request

gem install hub # on a mac you can `brew install hub`

hub fork

git push <your name> -your-name--update-docs-Mail--Multibyte--Chars-rindex-for-pr

hub pull-request

# Celebrate!