Why does the regular expression remove the letter B?

Question

PHP

Actually I'm trying to remove extra characters from a string with such a regular expression:

preg_replace('/([:^~|@№$–=+*&%;\[\]<>()_—«»#\/]+)/i', "", $some);

But for some reason, all the letters B, both small and large, are deleted in the text.
What could be the problem?
I don’t understand, everything is tested normally on regexp. Could it be a coding issue?

Answer 1

i checked the theory about the "unescaped hyphen"
if a hyphen is used in this place, _-«
then the regular expression haws like all characters from _ до «
if you look at the unicode character code "Underscore" _, we will see that it has a U+005Fserial number = 95
and "quotation mark", in its own turn U+00AB= 171
all Latin letters in lower case fall into this range,
and since you still have the "i" flag in the regular expression - case insensitivity, then this regular expression also includes Latin letters in Upper case
https://repl.it/ repls/SpryAzureAudit

Answer 2

No B is removed.
Added only /u for correct work with utf-8.

var_dump(preg_replace('/([:^~|@№$–=+*&%;\[\]<>()_—«»#\/]+)/iu', "", "Владимир владимирович #$#[email protected]%"));

Answer 3

try this regular expression '[^a-zA-Z0-9а-яА-ЯёЁ]+?'