Added a solution/fixed stub :) (#34198)

Added a solution to the stub regardingn Javascript Algorithms And Data Structures Certification\Regular Expressions

guide/english/certifications/javascript-algorithms-and-data-structures/regular-expressions/specify-exact-number-of-matches/index.md

@@ -3,8 +3,26 @@ title: Specify Exact Number of Matches
 ---
 ## Specify Exact Number of Matches
 
-This is a stub. <a href='https://github.com/freecodecamp/guides/tree/master/src/pages/certifications/javascript-algorithms-and-data-structures/regular-expressions/specify-exact-number-of-matches/index.md' target='_blank' rel='nofollow'>Help our community expand it</a>.
+### Hint 1:
+We see that the answer is simply finding 4 m's in a row. The first anwser would be to match EXACTLY 4 times the character so we shall implement as following:
+````javascript
+let timRegex = /m{4}/; 
+````
+This solution is incorrect because you wont pass the final test case ("Timber" with 30 m's in it) as there are multiple times mmmm in a row of 30 m.
+You should try to get **no more than** ***(4 times m) mmmm***. 
 
-<a href='https://github.com/freecodecamp/guides/blob/master/README.md' target='_blank' rel='nofollow'>This quick style guide will help ensure your pull request gets accepted</a>.
+### Hint 2:
+Based on the above I will try to specify exactly the characters before and after 4 times m!
+***Remember:***  e.g. /b/ is a string literal for the word b so what if before and after mmmm we add ALL missing letters?
+
+
+
+### Solution
+From hint 1 we defined how to find mmmm in the timStr. From hint 2 we observe that we need to find the word Timmmmber=Tim{4}ber.
+We simpply add the exact word in our timRegex value and the final result is:
+````javascript
+let timStr = "Timmmmber";
+let timRegex = /Tim{4}ber/; // Change this line
+let result = timRegex.test(timStr);
+````
 
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