Added new test cases and corrected the solution for positive and negative lookahead for ensuring that strings beginning with numbers are not accepted (#37485)

* Added new test case '8pass99' for positive and negative lookahead

* Changed the pwRegex to reflect the new solution

* Updated the pwRegex to reflect the latest solution as on forum

* Added another test case to catch "/^(?=\w{6,})(?=\D*\d{2})/" solution

curriculum/challenges/english/02-javascript-algorithms-and-data-structures/regular-expressions/positive-and-negative-lookahead.english.md

@@ -58,6 +58,12 @@ tests:
     testString: assert(!pwRegex.test("123"));
   - text: Your regex should not match <code>"1234"</code>
     testString: assert(!pwRegex.test("1234"));
+  - text: Your regex should not match <code>"8pass99"</code>
+    testString: assert(!pwRegex.test("8pass99"));
+  - text: Your regex should not match <code>"12abcde"</code>
+    testString: assert(!pwRegex.test("12abcde"));
+
+
 
 ```
 
@@ -85,7 +91,7 @@ let result = pwRegex.test(sampleWord);
 
 
 ```js
-var pwRegex = /(?=\w{6})(?=\D*\d{2})/;
+var pwRegex = /^(?=\w{6})(?=\D+\d{2})/;
 ```
 
 </section>