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run code in 300+ PHP versions simultaneously
<?php function get_numerics ($str) { preg_match_all('/[A-Za-z]/', $str, $matches); return $matches[0]; } $one = 'foo bar 1114 baz (5 qux quux)'; $two = 'bar baz 2 bar'; $three = 'qux bar 12 quux (3 foo)'; $four = 'foo baz 3 bar (13 quux foo)'; print_r(get_numerics($one)); print_r(get_numerics($two)); print_r(get_numerics($three)); print_r(get_numerics($four));

preferences:
54.65 ms | 402 KiB | 5 Q