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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 git.master, git.master_jit, rfc.property-hooks
Array ( [0] => <#tag> [1] => text <#tag> text [2] => text <#tag> [3] => text#tag ) <#111> тапинамбур#222 <#333> <#444>

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