Make space to dash with regexp

Question

I've got a sinatra app where I plan to make a friedly-urls on the fly. I've got a function with a regexp that looks like this, but it won't turn 'spaces' into 'dashes', ' ' to '-'.

def self.make_slug(title)
  title.downcase.gsub(/ /, '-').gsub(/[^a-z0-9_]/, '').squeeze('-')
end

Thanks in advance!

Update

Now I'm also trying to change åä into a and ö into o, my code looks like this but won't work, any ideas?

gsub(/[åä]/, 'a')
gsub(/[ö]/, 'o')

Answer 1

Whatever the language, you're first replacing " " with "-", and then replace everything but a-z0-9_ (thus, also "-") with "". Include "-" in the list like [^a-z0-9_-]