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run code in 150+ php & hhvm versions
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<?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 - 7.1.0
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 ) )