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run code in 150+ php & hhvm versions
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<?php $text = 'say hello to @elise and @john'; function replace_at_symbol($matches){ return '<a href="/profile/'.$matches[0].'">'.$matches[0].'</a>';} $output = preg_replace_callback("/([@][a-zA-Z-0-9]+)/", "replace_at_symbol", $text); echo $output; ?>
based on Dp6U3
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
say hello to <a href="/profile/@elise">@elise</a> and <a href="/profile/@john">@john</a>