Why does preg_match() return 0?

Question

PHP

Hello.

if (preg_match('/^[А-ЯЁ][а-яё]*(\s[А-ЯЁ][а-яё]*)?$/', $_POST['name']) === 1) {
        $valid = true;
      }

I checked, the expression works correctly.
The input is 100% valid data. Where did I screw up?

Answer 1

Exactly 0? Not false?
You can also look in the direction of Template modifiers , namely "u (PCRE_UTF8)"