3v4l.org

run code in 300+ PHP versions simultaneously
<?php $input = '1 foo 2 ba_r 3 foo bar 4 fo-o'; preg_match_all( '/(\d+)\s+(.*)/m', $input, $matches, PREG_SET_ORDER); print_r( $matches);
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.25, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
Array ( [0] => Array ( [0] => 1 foo [1] => 1 [2] => foo ) [1] => Array ( [0] => 2 ba_r [1] => 2 [2] => ba_r ) [2] => Array ( [0] => 3 foo bar [1] => 3 [2] => foo bar ) [3] => Array ( [0] => 4 fo-o [1] => 4 [2] => fo-o ) )

preferences:
235.69 ms | 406 KiB | 370 Q