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run code in 150+ php & hhvm versions
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<?php $pattern = '/((?<!\w)#\w+)/i'; $subject = <<<EOT Blablalb #toto zdjsdf #ho_yeah EOT; $hashtags = []; $result = preg_replace_callback('/(\s#\w+)/i', function ($matches) use(&$hastags) { var_dump($matches); $hashtags[] = trim($matches[0]); return ''; }, $subject); var_dump($result, $hashtags);
Output for 5.4.0 - 7.1.0
array(2) { [0]=> string(6) " #toto" [1]=> string(6) " #toto" } array(2) { [0]=> string(9) " #ho_yeah" [1]=> string(9) " #ho_yeah" } string(15) "Blablalb zdjsdf" array(0) { }
Output for 4.4.3 - 4.4.9, 5.1.0 - 5.1.1, 5.1.3 - 5.3.29
Parse error: syntax error, unexpected '[' in /in/jqu3A on line 8
Process exited with code 255.
Output for 4.4.2, 5.1.2
Parse error: syntax error, unexpected '[' in /in/jqu3A on line 9
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.4.1, 5.0.0 - 5.0.5
Parse error: parse error, unexpected '[' in /in/jqu3A on line 8
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/jqu3A on line 8
Process exited with code 255.