How can I access the user through regexp?

Question

PHP

What regular expression for preg_replace should be written to replace @username with a link in the string? those. there is an example code:

$str_search = ""; // ?
$str_replace = '<a href="/$1">$1</a>';
$text = "Пользователь @username - перейти";
preg_replace($str_search, $str_replace, $text);

Answer 1

$str_search = '~\@([^ ]*)~'; 
$str_replace = '<a href="/$1">$1</a>';
$text = "Пользователь @username - перейти";
echo preg_replace($str_search, $str_replace, $text);