diff --git a/curriculum/challenges/english/15-javascript-algorithms-and-data-structures-22/learn-advanced-array-methods-by-building-a-statistics-calculator/6352fcb156834128001ea945.md b/curriculum/challenges/english/15-javascript-algorithms-and-data-structures-22/learn-advanced-array-methods-by-building-a-statistics-calculator/6352fcb156834128001ea945.md
index ce08eddf035..9023b14bb54 100644
--- a/curriculum/challenges/english/15-javascript-algorithms-and-data-structures-22/learn-advanced-array-methods-by-building-a-statistics-calculator/6352fcb156834128001ea945.md
+++ b/curriculum/challenges/english/15-javascript-algorithms-and-data-structures-22/learn-advanced-array-methods-by-building-a-statistics-calculator/6352fcb156834128001ea945.md
@@ -28,13 +28,13 @@ assert.match(getVariance.toString(), /sumSquaredDifferences\s*=\s*squaredDiffere
 Your `sumSquaredDifferences` variable should use the `acc` and `el` parameters in the callback function.
 
 ```js
-assert.match(getVariance.toString(), /sumSquaredDifferences\s*=\s*squaredDifferences\.reduce\(function\s*\(?\s*acc\s*,\s*el\s*\)?/);
+assert.match(getVariance.toString(), /sumSquaredDifferences\s*=\s*squaredDifferences\.reduce\(function\s*\(\s*acc\s*,\s*el\s*\)/);
 ```
 
 Your `reduce` callback should return the sum of `acc` and `el`.
 
 ```js
-assert.match(getVariance.toString(), /sumSquaredDifferences\s*=\s*squaredDifferences\.reduce\(function\s*\(?\s*acc\s*,\s*el\s*\)?\s*\{\s*return\s*acc\s*\+\s*el\s*\;\s*\},\s*0\s*\)/);
+assert.match(getVariance.toString(), /sumSquaredDifferences\s*=\s*squaredDifferences\.reduce\(function\s*\(\s*acc\s*,\s*el\s*\)\s*\{\s*return\s*acc\s*\+\s*el\s*\;\s*\},\s*0\s*\)/);
 ```
 
 # --seed--
diff --git a/curriculum/challenges/english/15-javascript-algorithms-and-data-structures-22/learn-advanced-array-methods-by-building-a-statistics-calculator/6352fce75b2d3b2924930f1e.md b/curriculum/challenges/english/15-javascript-algorithms-and-data-structures-22/learn-advanced-array-methods-by-building-a-statistics-calculator/6352fce75b2d3b2924930f1e.md
index ac038412238..42dc92157d3 100644
--- a/curriculum/challenges/english/15-javascript-algorithms-and-data-structures-22/learn-advanced-array-methods-by-building-a-statistics-calculator/6352fce75b2d3b2924930f1e.md
+++ b/curriculum/challenges/english/15-javascript-algorithms-and-data-structures-22/learn-advanced-array-methods-by-building-a-statistics-calculator/6352fce75b2d3b2924930f1e.md
@@ -46,19 +46,19 @@ assert.match(getVariance.toString(), /variance\s*=\s*array\.reduce\(/);
 Your `variance` variable should use the `acc` and `el` parameters in the callback function.
 
 ```js
-assert.match(getVariance.toString(), /variance\s*=\s*array\.reduce\(function\s*\(?\s*acc\s*,\s*el\s*\)?/);
+assert.match(getVariance.toString(), /variance\s*=\s*array\.reduce\(function\s*\(\s*acc\s*,\s*el\s*\)/);
 ```
 
 Your `reduce` callback should be an empty function.
 
 ```js
-assert.match(getVariance.toString(), /variance\s*=\s*array\.reduce\(function\s*\(?\s*acc\s*,\s*el\s*\)?\s*\{\s*\}/);
+assert.match(getVariance.toString(), /variance\s*=\s*array\.reduce\(function\s*\(\s*acc\s*,\s*el\s*\)\s*\{\s*\}/);
 ```
 
 Your `reduce` callback should have an initial value of `0`.
 
 ```js
-assert.match(getVariance.toString(), /variance\s*=\s*array\.reduce\(function\s*\(?\s*acc\s*,\s*el\s*\)?\s*\{\s*\}\s*,\s*0\s*\)/);
+assert.match(getVariance.toString(), /variance\s*=\s*array\.reduce\(function\s*\(\s*acc\s*,\s*el\s*\)\s*\{\s*\}\s*,\s*0\s*\)/);
 ```
 
 # --seed--
diff --git a/curriculum/challenges/english/15-javascript-algorithms-and-data-structures-22/learn-advanced-array-methods-by-building-a-statistics-calculator/6352fe473d53592a40ae403b.md b/curriculum/challenges/english/15-javascript-algorithms-and-data-structures-22/learn-advanced-array-methods-by-building-a-statistics-calculator/6352fe473d53592a40ae403b.md
index a144d66e015..a83dc86a3fe 100644
--- a/curriculum/challenges/english/15-javascript-algorithms-and-data-structures-22/learn-advanced-array-methods-by-building-a-statistics-calculator/6352fe473d53592a40ae403b.md
+++ b/curriculum/challenges/english/15-javascript-algorithms-and-data-structures-22/learn-advanced-array-methods-by-building-a-statistics-calculator/6352fe473d53592a40ae403b.md
@@ -14,37 +14,37 @@ Within your empty `.reduce()` callback, declare a variable `difference` and set
 Your `reduce` callback should have a `difference` variable.
 
 ```js
-assert.match(getVariance.toString(), /variance\s*=\s*array\.reduce\(function\s*\(?\s*acc\s*,\s*el\s*\)?\s*\{\s*var\s+difference\s*=/);
+assert.match(getVariance.toString(), /variance\s*=\s*array\.reduce\(function\s*\(\s*acc\s*,\s*el\s*\)\s*\{\s*var\s+difference\s*=/);
 ```
 
 Your `difference` variable should be set to the value of `el` minus `mean`.
 
 ```js
-assert.match(getVariance.toString(), /variance\s*=\s*array\.reduce\(function\s*\(?\s*acc\s*,\s*el\s*\)?\s*\{\s*var\s+difference\s*=\s*el\s*-\s*mean\s*;/);
+assert.match(getVariance.toString(), /variance\s*=\s*array\.reduce\(function\s*\(\s*acc\s*,\s*el\s*\)\s*\{\s*var\s+difference\s*=\s*el\s*-\s*mean\s*;/);
 ```
 
 Your `reduce` callback should have a `squared` variable.
 
 ```js
-assert.match(getVariance.toString(), /variance\s*=\s*array\.reduce\(function\s*\(?\s*acc\s*,\s*el\s*\)?\s*\{\s*var\s+difference\s*=\s*el\s*-\s*mean\s*;\s*var\s+squared\s*=/);
+assert.match(getVariance.toString(), /variance\s*=\s*array\.reduce\(function\s*\(\s*acc\s*,\s*el\s*\)\s*\{\s*var\s+difference\s*=\s*el\s*-\s*mean\s*;\s*var\s+squared\s*=/);
 ```
 
 Your `squared` variable should be set to the value of `difference` to the power of 2.
 
 ```js
-assert.match(getVariance.toString(), /variance\s*=\s*array\.reduce\(function\s*\(?\s*acc\s*,\s*el\s*\)?\s*\{\s*var\s+difference\s*=\s*el\s*-\s*mean\s*;\s*var\s+squared\s*=\s*Math\.pow\(\s*difference\s*,\s*2\s*\);/);
+assert.match(getVariance.toString(), /variance\s*=\s*array\.reduce\(function\s*\(\s*acc\s*,\s*el\s*\)\s*\{\s*var\s+difference\s*=\s*el\s*-\s*mean\s*;\s*var\s+squared\s*=\s*Math\.pow\(\s*difference\s*,\s*2\s*\);/);
 ```
 
 Your `reduce` callback should return the value of `acc` plus `squared`.
 
 ```js
-assert.match(getVariance.toString(), /variance\s*=\s*array\.reduce\(function\s*\(?\s*acc\s*,\s*el\s*\)?\s*\{\s*var\s+difference\s*=\s*el\s*-\s*mean\s*;\s*var\s+squared\s*=\s*Math\.pow\(\s*difference\s*,\s*2\s*\);\s*return\s+acc\s*\+\s*squared\s*;/);
+assert.match(getVariance.toString(), /variance\s*=\s*array\.reduce\(function\s*\(\s*acc\s*,\s*el\s*\)\s*\{\s*var\s+difference\s*=\s*el\s*-\s*mean\s*;\s*var\s+squared\s*=\s*Math\.pow\(\s*difference\s*,\s*2\s*\);\s*return\s+acc\s*\+\s*squared\s*;/);
 ```
 
 You should not remove the initial value of `0` from your `.reduce()` method.
 
 ```js
-assert.match(getVariance.toString(), /variance\s*=\s*array\.reduce\(function\s*\(?\s*acc\s*,\s*el\s*\)?\s*\{\s*var\s+difference\s*=\s*el\s*-\s*mean\s*;\s*var\s+squared\s*=\s*Math\.pow\(\s*difference\s*,\s*2\s*\);\s*return\s+acc\s*\+\s*squared\s*;\s*\}\s*,\s*0\)/);
+assert.match(getVariance.toString(), /variance\s*=\s*array\.reduce\(function\s*\(\s*acc\s*,\s*el\s*\)\s*\{\s*var\s+difference\s*=\s*el\s*-\s*mean\s*;\s*var\s+squared\s*=\s*Math\.pow\(\s*difference\s*,\s*2\s*\);\s*return\s+acc\s*\+\s*squared\s*;\s*\}\s*,\s*0\)/);
 ```
 
 # --seed--
diff --git a/curriculum/challenges/english/15-javascript-algorithms-and-data-structures-22/learn-advanced-array-methods-by-building-a-statistics-calculator/6352fed209792d2b89e92ea1.md b/curriculum/challenges/english/15-javascript-algorithms-and-data-structures-22/learn-advanced-array-methods-by-building-a-statistics-calculator/6352fed209792d2b89e92ea1.md
index 117861dc74e..7fd13396f0e 100644
--- a/curriculum/challenges/english/15-javascript-algorithms-and-data-structures-22/learn-advanced-array-methods-by-building-a-statistics-calculator/6352fed209792d2b89e92ea1.md
+++ b/curriculum/challenges/english/15-javascript-algorithms-and-data-structures-22/learn-advanced-array-methods-by-building-a-statistics-calculator/6352fed209792d2b89e92ea1.md
@@ -16,7 +16,7 @@ Divide your `.reduce()` call by the length of the array (in your `variance` decl
 You should divide the result of the `.reduce()` call by the length of the array.
 
 ```js
-assert.match(getVariance.toString(), /variance\s*=\s*array\.reduce\(function\s*\(?\s*acc\s*,\s*el\s*\)?\s*\{\s*var\s+difference\s*=\s*el\s*-\s*mean\s*;\s*var\s+squared\s*=\s*Math\.pow\(\s*difference\s*,\s*2\s*\);\s*return\s+acc\s*\+\s*squared\s*;\s*\}\s*,\s*0\)\s*\/\s*array\.length;/);
+assert.match(getVariance.toString(), /variance\s*=\s*array\.reduce\(function\s*\(\s*acc\s*,\s*el\s*\)\s*\{\s*var\s+difference\s*=\s*el\s*-\s*mean\s*;\s*var\s+squared\s*=\s*Math\.pow\(\s*difference\s*,\s*2\s*\);\s*return\s+acc\s*\+\s*squared\s*;\s*\}\s*,\s*0\)\s*\/\s*array\.length;/);
 ```
 
 You should return the value of `variance`.