Why does JS match backtick in regular expression?

Question

JavaScript

Good day.

There is the following regular expression:
/^[A-Yaa-yaёЁ]+[A-Yaa-yaёЁ\s\-'\d]+[A-Yaa-yaёЁ\-'\d]$/i

When checking it in the devtools console (Google Chrome) - "matches" a string with a reverse apostrophe (which is on the key with the letter "ё")



Here is the code:

let str = 'тест`ТЕСТ 123-45-54 654'

let regexp = /^[A-Яа-яёЁ]+[A-Яа-яёЁ\s\-'\d]+[A-Яа-яёЁ\-'\d]$/i

str.match(regexp)

In sites-"sandboxes" for checking regular seasons, everything is fine, this line does not match.

Why does JS give a match to the specified string if the backtick character is not specified in the regular expression? How to fix this behavior?

Answer 1

[A-Z]
here the letter A is Latin, in the interval between Latin A and Russian I there are a lot of things. Check the letters.

Answer 2

Some kind of crap when using the range of capital letters A-Z in the list of characters. If it is not specified (and it does not need to be specified - after all, the i flag is specified), then everything works.