diff --git a/lib/rocco.rb b/lib/rocco.rb
index 9e2a0eb..f91895e 100644
--- a/lib/rocco.rb
+++ b/lib/rocco.rb
@@ -176,7 +176,7 @@ class Rocco
     # Do some post-processing on the pygments output to split things back
     # into sections and remove partial `<pre>` blocks.
     code_html = code_html.
-      split(/\n*<span class="c.">#{@options[:comment_chars]} DIVIDER<\/span>\n*/m).
+      split(/\n*<span class="c.?">#{@options[:comment_chars]} DIVIDER<\/span>\n*/m).
       map { |code| code.sub(/\n?<div class="highlight"><pre>/m, '') }.
       map { |code| code.sub(/\n?<\/pre><\/div>\n/m, '') }