[gfm] only do backtracking (extended autolink path validation) for ww…

…w or http autolinks

lib/marked.js

@@ -705,22 +705,23 @@ InlineLexer.prototype.output = function(src) {
 
     // url (gfm)
     if (!this.inLink && (cap = this.rules.url.exec(src))) {
-      do {
-        prevCapZero = cap[0];
-        cap[0] = this.rules._backpedal.exec(cap[0])[0];
-      } while (prevCapZero !== cap[0]);
-      src = src.substring(cap[0].length);
       if (cap[2] === '@') {
         text = escape(cap[0]);
         href = 'mailto:' + text;
       } else {
+        // do extended autolink path validation
+        do {
+          prevCapZero = cap[0];
+          cap[0] = this.rules._backpedal.exec(cap[0])[0];
+        } while (prevCapZero !== cap[0]);
         text = escape(cap[0]);
         if (cap[1] === 'www.') {
           href = 'http://' + text;
         } else {
           href = text;
         }
       }
+      src = src.substring(cap[0].length);
       out += this.renderer.link(href, null, text);
       continue;
     }