<?php $var = array( '#tag', 'text #tag text', 'text #tag', 'text#tag', ); $res = preg_replace('/(?<=^|\s)#\S{1,24}+(?=$|\s)/u', '#<$1>' , $var); print_r($res); echo preg_replace('/\B#(\S{1,24}+)/u', '<$0>' , '#111 тапинамбур#222 #333 #444');
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