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run code in 150+ php & hhvm versions
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<?php echo preg_replace('/#(\S{1,24}+)/u', '<$0>', 'sdfsdf sdfsdf d&#блабла fdfdfdf').PHP_EOL;
Output for 4.3.10 - 4.4.9, 5.0.2 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
sdfsdf sdfsdf d&<#блабла> fdfdfdf
Output for 4.3.0 - 4.3.9, 5.0.0 - 5.0.1
Notice: Use of undefined constant PHP_EOL - assumed 'PHP_EOL' in /in/c2ubu on line 2 sdfsdf sdfsdf d&<#блабла> fdfdfdfPHP_EOL