Ruby post title to slug

Is this Rails? (works in Sinatra)

string.parameterize

That's it. For even more sophisticated slugging, see ActsAsUrl. It can do the following:

"rock & roll".to_url => "rock-and-roll""$12 worth of Ruby power".to_url => "12-dollars-worth-of-ruby-power""10% off if you act now".to_url => "10-percent-off-if-you-act-now""kick it en Français".to_url => "kick-it-en-francais""rock it Español style".to_url => "rock-it-espanol-style""tell your readers 你好".to_url => "tell-your-readers-ni-hao"

slug = title.downcase.strip.gsub(' ', '-').gsub(/[^\w-]/, '')

downcase makes it lowercase. The strip makes sure there is no leading or trailing whitespace. The first gsub replaces spaces with hyphens. The second gsub removes all non-alpha non-dash non-underscore characters (note that this set is very close to \W but includes the dash as well, which is why it's spelled out here).

to_slug is a great Rails plugin that handles pretty much everything, including funky characters, but its implementation is very simple. Chuck it onto String and you'll be sorted. Here's the source condensed down:

String.class_eval do  def to_slug    value = self.mb_chars.normalize(:kd).gsub(/[^\x00-\x7F]/n, '').to_s    value.gsub!(/[']+/, '')    value.gsub!(/\W+/, ' ')    value.strip!    value.downcase!    value.gsub!(' ', '-')    value  endend