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<?php $var = array( '#tag', 'text #tag text', 'text #tag', 'text#tag', ); $res = preg_replace('/(?<=\s)#\S{1,24}+/u', '<$0>' , $var); print_r($res); echo preg_replace('/(?<=\s)#\S{1,24}+/u', '<$0>' , '#111 тапинамбур#222 #333 #444');
Output for 4.3.0 - 7.1.0
Array ( [0] => #tag [1] => text <#tag> text [2] => text <#tag> [3] => text#tag ) #111 тапинамбур#222 <#333> <#444>