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@ 2014-04-22T13:17:00Z

<?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('/(?<!\S)#\S{1,24}+(?!\S)/u', '<$0>' , '#111 тапинамбур#222 #333 #444');

Output
Performance
VLD
References
Branches

print_r: documentation ( source)
preg_replace: documentation ( source)

preferences:dark modelive preview

42.59 ms | 402 KiB | 5 Q