How to write a search for Russian capital letters in a string (regexp, php)?

Question

PHP

File encoding: UTF-8
Code:

$string = "Test123 Тест";
echo preg_replace('![A-Z|А-Я]!','',$string);

Result:
est123 ст
Question:
Why did the regular season affect the lowercase Russian character "e"?
Regular expression misspelled?

Answer 1

echo preg_replace('![A-Z|А-Я]!u','-',$string);
www.php.net/manual/ru/reference.pcre.pattern.modif...
Modifier 'u'

Answer 2

I'm not a regular season specialist myself, but try
preg_replace('/[^a-zа-я\d\s]/', '', $string)

Answer 3

habrahabr.ru/post/45910