Those pesky underscore characters.

. doesn't include space characters while the most common way of handling [^] does but according to the description there're only alphanumeric characters here.

So, effectively (.) === ([^]) ?

Thanks friend!

4, 4, 9 would be true.

The . wildcard doesn't match newlines. The [^] expression matches everything.

Thanks!

Cannot pass it on PHP.

Strangely, random test passes OK, but testBasic fails.

Moreover, in testBasic code I see only two tests, but when running there are three. I dumped arrays and cannot find the issue.

Time: 405ms Passed: 1 Failed: 1
Test Results:
AreTheyTheSameTestCases
testBasics
Log
Array
(
[0] => 121
[1] => 361
[2] => 361
[3] => 361
[4] => 14641
[5] => 20736
[6] => 20736
[7] => 25921
)
Array
(
[0] => 121
[1] => 361
[2] => 361
[3] => 361
[4] => 14641
[5] => 20736
[6] => 20736
[7] => 25921
)
1Array
(
[0] => 121
[1] => 361
[2] => 361
[3] => 361
[4] => 14641
[5] => 20736
[6] => 20736
[7] => 25921
)
Array
(
[0] => 231
[1] => 361
[2] => 361
[3] => 361
[4] => 14641
[5] => 20736
[6] => 20736
[7] => 25921
)
Array
(
[0] => 121
[1] => 361
[2] => 361
[3] => 361
[4] => 14641
[5] => 20736
[6] => 20736
[7] => 25921
)
Array
(
[0] => 121
[1] => 361
[2] => 361
[3] => 14641
[4] => 20736
[5] => 20736
[6] => 25921
[7] => 36100
)
✘ Failed asserting that false matches expected true.
Completed in 0.29ms
testRandom (1 Passed, 0 Failed)

Excellent kata!

Only the first "2" has its square.

This is so neat! I love it.

This made my day.

There is no mistake, only the first 2 has a square. As you can see at the top of the page 1054 guys passed the JS kata. Cheers!

A[2,2,3]
B[4,9,9]

Why this is false. I believe there is a mistake.