Got it thank you
misunderstood examples

Read the posts below: https://www.codewars.com/kata/5bcd90808f9726d0f6000091/discuss#629cb8ce24b98138b7fe4a9c

How do you pass this test? test.assert_equals(longest_substring("hchzvfrkmlnozjk"), 11,"'chzvfrkmlno' is the longest substring.")
where is J here? what are you unable to do?
Are there hidden conditions?
Description not complete?
Help me I'm new here

Ok, that's it!

by direct update, do you mean Editing the kata, or modifying the translation that was approved ? I think editing an approved translation has no effect; and they do not get updated when the kata is modified, as far as i know.
on the other hand, if you directly edit the kata (and hit Re-Publish, of course) and it does not work then it is really weird...

I'm confused about this, can you explain more pls?

One backslash is one character, line any other. To write a single backslash literal it is necessary to write actually two consecutive backslashes but it has nothing to do with the task here.

do i need to account for backslashes? since \ = one backslash?
for example if i have "abcd\e" should i get 5 ("abcd") or 6 ("abcd\e")?

my code works for basic tests but it always comes up 2 short in random tests. sometimes more.