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run code in 150+ php & hhvm versions
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<?php $var = array( '#tag', 'text #tag text', 'text #tag', 'text#tag', ); $res = preg_replace('/(?<=^|\s)#\S{1,24}+(?=$|\s)/u', '$0' , $var); print_r($res); echo preg_replace('/\B#(\S{1,24}+)/u', '<$0>' , '#111 тапинамбур#222 #333 #444');
Output for 5.3.4 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
Array ( [0] => #tag [1] => text #tag text [2] => text #tag [3] => text#tag ) <#111> тапинамбур#222 <#333> <#444>
Output for 4.3.0 - 5.3.3
Array ( [0] => #tag [1] => text #tag text [2] => text #tag [3] => text#tag ) <#111> тапинамбур<#222> <#333> <#444>