The Ruby %r{ } expression

Question

In a model there is a field

validates :image_file_name, :format => { :with => %r{\\.(gif|jpg|jpeg|png)$}i

It looks pretty odd for me.

Answer 1

With %r, you could use any delimiters.

You could use %r{} or %r[] or %r!! etc.

The benefit of using other delimeters is that you don't need to escape the / used in normal regex literal.