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run code in 150+ php & hhvm versions
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<?php $pattern="/\(((?>[^()]+)|(?R))*\)/"; $str=<<<EOL (def a (x) (+ 1 x)) (print (a 1)) EOL preg_match_all($pattern,$str,$out); var_dump($out);
Output for 5.4.0 - 5.4.26
Parse error: syntax error, unexpected 'preg_match_all' (T_STRING) in /in/k4Op5 on line 13
Process exited with code 255.
Output for 4.4.3 - 4.4.9, 5.1.0 - 5.1.1, 5.1.3 - 5.3.28
Parse error: syntax error, unexpected T_STRING in /in/k4Op5 on line 13
Process exited with code 255.
Output for 4.4.2, 5.1.2
Parse error: syntax error, unexpected T_STRING in /in/k4Op5 on line 14
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 T_STRING in /in/k4Op5 on line 13
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/k4Op5 on line 13
Process exited with code 255.