fix markdown links that have trailing punctuation inside the url

app/models/comment.rb

@@ -31,6 +31,15 @@ class Comment < ActiveRecord::Base
       errors.add(:base, (m[1] == "T" ? "N" : "n") + "ope" + m[2].to_s)
   end
 
+  def self.regenerate_markdown
+    Comment.all.each do |c|
+      c.markeddown_comment = c.generated_markeddown_comment
+      Comment.record_timestamps = false
+      c.save(:validate => false)
+    end
+    nil
+  end
+
   def assign_short_id_and_upvote
     10.times do |try|
       if try == 10

extras/markdowner.rb

@@ -7,7 +7,17 @@ class Markdowner
         :filter_styles, :filter_html).to_html
 
       # change <h1> headings to just emphasis tags
-      html.gsub!(/<(\/)?h(\d)>/) { |_| "<#{$1}strong>" }
+      html.gsub!(/<(\/)?h(\d)>/) {|_| "<#{$1}strong>" }
+
+      # fix links that got the trailing punctuation appended to move it outside
+      # the link
+      html.gsub!(/<a ([^>]+)([\.\!\,])">([^>]+)([\.\!\,])<\/a>/) {|_|
+        if $2.to_s == $4.to_s
+          "<a #{$1}\">#{$3}</a>#{$2}"
+        else
+          _
+        end
+      }
 
       # make links have rel=nofollow
       html.gsub!(/<a href/, "<a rel=\"nofollow\" href")