fix(challenges): add test to check user is using \W in Regex

Add test to make sure user is using \W and not ^\w

challenges/02-javascript-algorithms-and-data-structures/regular-expressions.json

@@ -944,6 +944,10 @@
           "text": "Your regex should find 6 non-alphanumeric characters in <code>\"The five boxing wizards jump quickly.\"</code>.",
           "testString": "assert(\"The five boxing wizards jump quickly.\".match(nonAlphabetRegex).length == 6, 'Your regex should find 6 non-alphanumeric characters in <code>\"The five boxing wizards jump quickly.\"</code>.');"
         },
+        {
+          "text": "Your regex should use the shorthand character.",
+          "testString":"assert(/\\\\W/.test(nonAlphabetRegex.source), 'Your regex should use the shorthand character to match characters which are non-alphanumeric.');"
+        },
         {
           "text": "Your regex should find 8 non-alphanumeric characters in <code>\"Pack my box with five dozen liquor jugs.\"</code>",
           "testString": "assert(\"Pack my box with five dozen liquor jugs.\".match(nonAlphabetRegex).length == 8, 'Your regex should find 8 non-alphanumeric characters in <code>\"Pack my box with five dozen liquor jugs.\"</code>');"
@@ -1718,4 +1722,4 @@
       }
     }
   ]
-}
+}