diff --git a/challenges/01-front-end-development-certification/advanced-bonfires.json b/challenges/01-front-end-development-certification/advanced-bonfires.json
index f5bc85349f9..fa82190d7c4 100644
--- a/challenges/01-front-end-development-certification/advanced-bonfires.json
+++ b/challenges/01-front-end-development-certification/advanced-bonfires.json
@@ -25,7 +25,7 @@
         "telephoneCheck(\"555-555-5555\");"
       ],
       "solutions": [
-        "var re = /^(?:(?:\\+?1\\s*(?:[.-]\\s*)?)?(?:\\(\\s*([2-9]1[02-9]|[2-9][02-8]1|[2-9][02-8][02-9])\\s*\\)|([2-9]1[02-9]|[2-9][02-8]1|[2-9][02-8][02-9]))\\s*(?:[.-]\\s*)?)?([2-9]1[02-9]|[2-9][02-9]1|[2-9][02-9]{2})\\s*(?:[.-]\\s*)?([0-9]{4})$/;\n\nfunction telephoneCheck(str) {\n  return !!str.match(re);\n}\n\ntelephoneCheck(\"555-555-5555\");"
+        "var re = /^([+]?1[\\s]?)?((?:[(](?:[2-9]1[02-9]|[2-9][02-8][0-9])[)][\\s]?)|(?:(?:[2-9]1[02-9]|[2-9][02-8][0-9])[\\s.-]?)){1}([2-9]1[02-9]|[2-9][02-9]1|[2-9][02-9]{2}[\\s.-]?){1}([0-9]{4}){1}$/;\n\nfunction telephoneCheck(str) {\n  return re.test(str);\n}\n\ntelephoneCheck(\"555-555-5555\");"
       ],
       "tests": [
         "assert(typeof telephoneCheck(\"555-555-5555\") === \"boolean\", 'message: <code>telephoneCheck(\"555-555-5555\")</code> should return a boolean.');",
@@ -35,6 +35,8 @@
         "assert(telephoneCheck(\"555-555-5555\") === true, 'message: <code>telephoneCheck(\"555-555-5555\")</code> should return true.');",
         "assert(telephoneCheck(\"(555)555-5555\") === true, 'message: <code>telephoneCheck(\"(555)555-5555\")</code> should return true.');",
         "assert(telephoneCheck(\"1(555)555-5555\") === true, 'message: <code>telephoneCheck(\"1(555)555-5555\")</code> should return true.');",
+        "assert(telephoneCheck(\"555-5555\") === false, 'message: <code>telephoneCheck(\"555-5555\")</code> should return false.');",
+        "assert(telephoneCheck(\"5555555\") === false, 'message: <code>telephoneCheck(\"5555555\")</code> should return false.');",
         "assert(telephoneCheck(\"1 555)555-5555\") === false, 'message: <code>telephoneCheck(\"1 555)555-5555\")</code> should return false.');",
         "assert(telephoneCheck(\"1 555 555 5555\") === true, 'message: <code>telephoneCheck(\"1 555 555 5555\")</code> should return true.');",
         "assert(telephoneCheck(\"1 456 789 4444\") === true, 'message: <code>telephoneCheck(\"1 456 789 4444\")</code> should return true.');",
@@ -51,7 +53,8 @@
         "assert(telephoneCheck(\"2(757)6227382\") === false, 'message: <code>telephoneCheck(\"2(757)6227382\")</code> should return false.');",
         "assert(telephoneCheck(\"2(757)622-7382\") === false, 'message: <code>telephoneCheck(\"2(757)622-7382\")</code> should return false.');",
         "assert(telephoneCheck(\"555)-555-5555\") === false, 'message: <code>telephoneCheck(\"555)-555-5555\")</code> should return false.');",
-        "assert(telephoneCheck(\"(555-555-5555\") === false, 'message: <code>telephoneCheck(\"(555-555-5555\")</code> should return false.');"
+        "assert(telephoneCheck(\"(555-555-5555\") === false, 'message: <code>telephoneCheck(\"(555-555-5555\")</code> should return false.');",
+        "assert(telephoneCheck(\"(555)5(55?)-5555\") === false, 'message: <code>telephoneCheck(\"(555)5(55?)-5555\")</code> should return false.');"
       ],
       "type": "bonfire",
       "MDNlinks": [