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run code in 150+ php & hhvm versions
Bugs & Features
<?php $pattern="\( ( (?>[^()]+) | (?R) )* \)"; $str="(def a (x) (+ 1 x))(print (a 1))"; var_dump(preg_grep(pattern,str));
Output for 5.2.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
Notice: Use of undefined constant pattern - assumed 'pattern' in /in/juPI5 on line 9 Notice: Use of undefined constant str - assumed 'str' in /in/juPI5 on line 9 Warning: preg_grep() expects parameter 2 to be array, string given in /in/juPI5 on line 9 NULL
Output for hhvm-3.10.0

Process exited with code 153.
Output for 4.3.11 - 5.1.6
Notice: Use of undefined constant pattern - assumed 'pattern' in /in/juPI5 on line 9 Notice: Use of undefined constant str - assumed 'str' in /in/juPI5 on line 9 Warning: preg_grep(): Second argument to preg_grep() should be an array in /in/juPI5 on line 9 NULL
Output for 4.3.0 - 4.3.10
Notice: Use of undefined constant pattern - assumed 'pattern' in /in/juPI5 on line 9 Notice: Use of undefined constant str - assumed 'str' in /in/juPI5 on line 9 Warning: Second argument to preg_grep() should be an array in /in/juPI5 on line 9 NULL