From 4adc35aaf36ee30a7fef708950bbb2958d2a7681 Mon Sep 17 00:00:00 2001
From: Chris Frederick <chris.frederick@github.com>
Date: Tue, 2 Sep 2014 14:32:14 +0900
Subject: [PATCH] Revise Utils#slugify with inspiration from Rails

---
 lib/jekyll/utils.rb | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/lib/jekyll/utils.rb b/lib/jekyll/utils.rb
index 67fc6637..d528f22d 100644
--- a/lib/jekyll/utils.rb
+++ b/lib/jekyll/utils.rb
@@ -110,10 +110,12 @@ module Jekyll
     # sequence of spaces and non-alphanumeric characters replaced with a
     # hyphen.
     def slugify(string)
-      if string.nil?
-        nil
-      else
-        string.downcase.gsub(/[^\w]/, " ").strip.gsub(/\s+/, '-')
+      unless string.nil?
+        # Replace each non-alphanumeric character sequence with a hyphen
+        slug = string.gsub(/[^a-z0-9]+/i, '-')
+        # Remove leading/trailing hyphen
+        slug.gsub!(/^\-|\-$/i, '')
+        slug.downcase
       end
     end