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@@ -545,38 +545,32 @@ module ActionView
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         end
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         AUTO_LINK_RE = %r{
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-                        (                          # leading text
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-                          <\w+.*?>|                # leading HTML tag, or
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-                          [^=!:'"/]|               # leading punctuation, or
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-                          ^                        # beginning of line
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-                        )
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-                        (
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-                          (?:https?://)|           # protocol spec, or
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-                          (?:www\.)                # www.*
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-                        )
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-                        (
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-                          [-\w]+                   # subdomain or domain
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-                          (?:\.[-\w]+)*            # remaining subdomains or domain
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-                          (?::\d+)?                # port
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-                          (?:/(?:[~\w\+@%=\(\)-]|(?:[,.;:'][^\s$]))*)* # path
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-                          (?:\?[\w\+@%&=.;:-]+)?     # query string
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-                          (?:\#[\w\-]*)?           # trailing anchor
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-                        )
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-                        ([[:punct:]]|<|$|)       # trailing text
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-                       }x unless const_defined?(:AUTO_LINK_RE)
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+            ( https?:// | www\. )
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+            [^\s<]+
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+          }x unless const_defined?(:AUTO_LINK_RE)
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         # Turns all urls into clickable links.  If a block is given, each url
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         # is yielded and the result is used as the link text.
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         def auto_link_urls(text, html_options = {})
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-          extra_options = tag_options(html_options.stringify_keys) || ""
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+          link_attributes = html_options.stringify_keys
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           text.gsub(AUTO_LINK_RE) do
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-            all, a, b, c, d = $&, $1, $2, $3, $4
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-            if a =~ /<a\s/i # don't replace URL's that are already linked
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-              all
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+            href = $&
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+            # detect already linked URLs
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+            unless $` =~ /<a\s[^>]*href="$/
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+              if href =~ /[^\w\/-]$/
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+                punctuation = href[-1, 1]
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+                href = href[0, href.length - 1]
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+              else
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+                punctuation = ''
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+              end
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+
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+              link_text = block_given?? yield(href) : href
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+              href = 'http://' + href unless href.index('http') == 0
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+
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+              content_tag(:a, h(link_text), link_attributes.merge('href' => href)) + punctuation
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             else
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-              text = b + c
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-              text = yield(text) if block_given?
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-              %(#{a}<a href="#{b=="www."?"http://www.":b}#{c}"#{extra_options}>#{text}</a>#{d})
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+              # do not change string; URL is alreay linked
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+              href
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             end
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           end
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         end

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@@ -225,36 +225,41 @@ class TextHelperTest < ActionView::TestCase
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             )
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     urls.each do |url|
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-      assert_equal %(<a href="#{url}">#{url}</a>), auto_link(url)
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+      assert_equal %(<a href="#{CGI::escapeHTML url}">#{CGI::escapeHTML url}</a>), auto_link(url)
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     end
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   end
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+  def generate_result(link_text, href = nil)
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+    href ||= link_text
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+    %{<a href="#{CGI::escapeHTML href}">#{CGI::escapeHTML link_text}</a>}
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+  end
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+
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   def test_auto_linking
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     email_raw    = 'david@loudthinking.com'
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     email_result = %{<a href="mailto:#{email_raw}">#{email_raw}</a>}
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     email2_raw    = '+david@loudthinking.com'
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     email2_result = %{<a href="mailto:#{email2_raw}">#{email2_raw}</a>}
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     link_raw     = 'http://www.rubyonrails.com'
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-    link_result  = %{<a href="#{link_raw}">#{link_raw}</a>}
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+    link_result  = generate_result(link_raw)
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     link_result_with_options  = %{<a href="#{link_raw}" target="_blank">#{link_raw}</a>}
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     link2_raw    = 'www.rubyonrails.com'
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-    link2_result = %{<a href="http://#{link2_raw}">#{link2_raw}</a>}
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+    link2_result = generate_result(link2_raw, "http://#{link2_raw}")
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     link3_raw    = 'http://manuals.ruby-on-rails.com/read/chapter.need_a-period/103#page281'
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-    link3_result = %{<a href="#{link3_raw}">#{link3_raw}</a>}
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+    link3_result = generate_result(link3_raw)
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     link4_raw    = 'http://foo.example.com/controller/action?parm=value&p2=v2#anchor123'
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-    link4_result = %{<a href="#{link4_raw}">#{link4_raw}</a>}
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+    link4_result = generate_result(link4_raw)
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     link5_raw    = 'http://foo.example.com:3000/controller/action'
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-    link5_result = %{<a href="#{link5_raw}">#{link5_raw}</a>}
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+    link5_result = generate_result(link5_raw)
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     link6_raw    = 'http://foo.example.com:3000/controller/action+pack'
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-    link6_result = %{<a href="#{link6_raw}">#{link6_raw}</a>}
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+    link6_result = generate_result(link6_raw)
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     link7_raw    = 'http://foo.example.com/controller/action?parm=value&p2=v2#anchor-123'
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-    link7_result = %{<a href="#{link7_raw}">#{link7_raw}</a>}
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+    link7_result = generate_result(link7_raw)
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     link8_raw    = 'http://foo.example.com:3000/controller/action.html'
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-    link8_result = %{<a href="#{link8_raw}">#{link8_raw}</a>}
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+    link8_result = generate_result(link8_raw)
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     link9_raw    = 'http://business.timesonline.co.uk/article/0,,9065-2473189,00.html'
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-    link9_result = %{<a href="#{link9_raw}">#{link9_raw}</a>}
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+    link9_result = generate_result(link9_raw)
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     link10_raw    = 'http://www.mail-archive.com/ruby-talk@ruby-lang.org/'
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-    link10_result = %{<a href="#{link10_raw}">#{link10_raw}</a>}
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+    link10_result = generate_result(link10_raw)
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     assert_equal %(hello #{email_result}), auto_link("hello #{email_raw}", :email_addresses)
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     assert_equal %(Go to #{link_result}), auto_link("Go to #{link_raw}", :urls)
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@@ -299,7 +304,13 @@ class TextHelperTest < ActionView::TestCase
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     assert_equal '', auto_link(nil)
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     assert_equal '', auto_link('')
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     assert_equal "#{link_result} #{link_result} #{link_result}", auto_link("#{link_raw} #{link_raw} #{link_raw}")
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-    assert_equal '<a href="http://www.rubyonrails.com">Ruby On Rails</a>', auto_link('<a href="http://www.rubyonrails.com">Ruby On Rails</a>')
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+  end
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+
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+  def test_auto_link_already_linked
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+    linked1 = generate_result('Ruby On Rails', 'http://www.rubyonrails.com')
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+    linked2 = generate_result('www.rubyonrails.com', 'http://www.rubyonrails.com')
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+    assert_equal linked1, auto_link(linked1)
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+    assert_equal linked2, auto_link(linked2)
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   end
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   def test_auto_link_at_eol
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@@ -317,7 +328,7 @@ class TextHelperTest < ActionView::TestCase
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   end
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0
   def test_auto_link_with_options_hash
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-    assert_equal 'Welcome to my new blog at <a href="http://www.myblog.com/" class="menu" target="_blank">http://www.myblog.com/</a>. Please e-mail me at <a href="mailto:me@email.com">me@email.com</a>.',
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+    assert_dom_equal 'Welcome to my new blog at <a href="http://www.myblog.com/" class="menu" target="_blank">http://www.myblog.com/</a>. Please e-mail me at <a href="mailto:me@email.com">me@email.com</a>.',
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       auto_link("Welcome to my new blog at http://www.myblog.com/. Please e-mail me at me@email.com.",
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                 :link => :all, :html => { :class => "menu", :target => "_blank" })
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   end