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<?php $var = array( '#tag', 'text #tag text', 'text #tag', 'text#tag', ); $res = preg_filter('/\B#(\S{1,24}+)/u', '#<$1>' , $var); print_r($res); echo preg_replace('/\b#(\S{1,24}+)/u', '#<$1>' , 'text#tag');
Output for git.master_jit, git.master, rfc.property-hooks
Array ( [0] => #<tag> [1] => text #<tag> text [2] => text #<tag> ) text#<tag>

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