fix backslash hack parse error

Author: suisho

index.js

@@ -202,7 +202,7 @@ module.exports = function(css, options){
     var pos = position();
 
     // prop
-    var prop = match(/^(\*?[-#\/\*\w]+(\[[0-9a-z_-]+\])?)\s*/);
+    var prop = match(/^(\*?[-#\/\*\\\w]+(\[[0-9a-z_-]+\])?)\s*/);
     if (!prop) return;
     prop = trim(prop[0]);
 

test/cases/comment.in.css

@@ -1,4 +1,5 @@
 a {
     color/**/: 12px;
     padding/*4815162342*/: 1px /**/ 2px /*13*/ 3px;
-}
+    border/*\**/: solid; border-top/*\**/: none\9;
+}

test/cases/comment.in.json

@@ -39,6 +39,38 @@
               },
               "source": "comment.in.css"
             }
+          },
+          {
+            "type": "declaration",
+            "property": "border",
+            "value": "solid",
+            "position": {
+              "start": {
+                "line": 4,
+                "column": 5
+              },
+              "end": {
+                "line": 4,
+                "column": 24
+              },
+              "source": "comment.in.css"
+            }
+          },
+          {
+            "type": "declaration",
+            "property": "border-top",
+            "value": "none\\9",
+            "position": {
+              "start": {
+                "line": 4,
+                "column": 26
+              },
+              "end": {
+                "line": 4,
+                "column": 50
+              },
+              "source": "comment.in.css"
+            }
           }
         ],
         "position": {
@@ -47,7 +79,7 @@
             "column": 1
           },
           "end": {
-            "line": 4,
+            "line": 5,
             "column": 2
           },
           "source": "comment.in.css"