How to convert a hashtag into a link?

Question

PHP

I pull out the news from the contact using wall.get. I get the text of the news with hashtags. Hashtags come as plain text. With this function, I replace hashtags with links, but only English hashtags change. What regular expression is needed to select Cyrillic

function hashtag($text){
    $pattern = "/\#(\w+)/";
    $text= preg_replace($pattern, '<a href="http://vk.com/feed?q=%23$1&section=search" target="_blank">#$1</a>',$text);
    echo $text;
}

Answer 1

first try
to make your expression ignore case and work with multibyte characters

Answer 2

/\#[^A-Za-zА-Яа-яЁё]+/u
u - to work with UTF-8