Preg_Grep says
<br />
<b>Fatal error</b>:  Uncaught Error: Call to undefined function each() in /home/rappleto/pub/Classes/PHP/Regular-Expressions/regular_expressions.php:20
Stack trace:
#0 /home/rappleto/pub/Classes/PHP/Regular-Expressions/regular_expressions.php(14): printArray()
#1 {main}
  thrown in <b>/home/rappleto/pub/Classes/PHP/Regular-Expressions/regular_expressions.php</b> on line <b>20</b><br />