3v4l.org

run code in 300+ PHP versions simultaneously
<?php $comment = "@name kdfjd @@ fkjd as@name @ lkjlkj @name"; var_export( preg_replace( '/(?<=^| )@([^@ ]+)/', '<a href="/$1">$0</a>', $comment ) );
Output for 8.1.0 - 8.1.34, 8.2.0 - 8.2.30, 8.3.0 - 8.3.30, 8.4.1 - 8.4.18, 8.5.0 - 8.5.3
'<a href="/name">@name</a> kdfjd @@ fkjd as@name @ lkjlkj <a href="/name">@name</a>'

preferences:
62.28 ms | 987 KiB | 4 Q