PHP regular expression to detect that there are no Russian letters

Practice




PHP regular expression to determine that there are no Russian letters?
please advise

if ( preg_match( '~[а-яА-ЯЁё]~', $stringinput ) )
{
echo "Есть русские буквы";
}
else
{
echo "Нету ни одной русской буквы";
}

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