$re = '/(?<Command>\/(?:.|\n(?:\t| +).)*$)/m';
$str = '/run attribute 0 "Hello, World!" idNameWoo true [0, 0] minecraft:grass_block run time set 0
/multiline
attribute
0
"Hello, World!"
idNameWoo
true
[0, 0]
minecraft:grass_block
run time set 0';
preg_match_all($re, $str, $matches, PREG_SET_ORDER, 0);
// Print the entire match result
var_dump($matches);
Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for PHP, please visit: http://php.net/manual/en/ref.pcre.php