Fix comments: comments must start with #\s not just #

org/keyword.go

@@ -35,7 +35,7 @@ type Include struct {
 }
 
 var keywordRegexp = regexp.MustCompile(`^(\s*)#\+([^:]+):(\s+(.*)|$)`)
-var commentRegexp = regexp.MustCompile(`^(\s*)#(.*)`)
+var commentRegexp = regexp.MustCompile(`^(\s*)#\s(.*)`)
 
 var includeFileRegexp = regexp.MustCompile(`(?i)^"([^"]+)" (src|example|export) (\w+)$`)
 var attributeRegexp = regexp.MustCompile(`(?:^|\s+)(:[-\w]+)\s+(.*)$`)

org/testdata/keywords.html

@@ -25,3 +25,4 @@ named block
 </pre>
 </div>
 </div>
+<p>#not a comment because there&#39;s no space after the hashtag</p>

org/testdata/keywords.org

@@ -20,3 +20,6 @@ named paragraph
 #+begin_src
 named block
 #+end_src
+
+# comments must have whitespace after the hashtag
+#not a comment because there's no space after the hashtag

org/testdata/keywords.pretty_org

@@ -20,3 +20,6 @@ named paragraph
 #+BEGIN_SRC
 named block
 #+END_SRC
+
+# comments must have whitespace after the hashtag
+#not a comment because there's no space after the hashtag