Get the diference between two strings without using arrays

manpreet Best Answer 2 years ago

I have the next problem and I need some litle help. Basically I have two b.com/tag/strings">strings $A and $B sorted by integers. The implemented function must output {A - B} and {B - A} and the code must be WITHOUT ARRAYS. Any idea?

Input:

$A = "1 2 3 8 9"; 
$B = "2 5 9 10 12 14";

Output:

{A - B} = "1 3 8"; 
{B - A} = "5 10 12 14";

manpreet 2 years ago

$A = "1 2 3 8 9"; 
$B = "2 5 9 10 12 14";

//Build b.com/tag/regular">regular expression pattern from $A
$pattern = "/\b".str_replace(" ", "\b|\b", $A)."\b/";

//Remove matched numbers within word boundaries
$result = preg_replace($pattern, "", $B);

//Remove any duplicate whitespace
$result = preg_replace("!\s+!", " ", $result);

b.com/tag/echo">echo "{B - A} = " . $result;