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​x
 
<!DOCTYPE html>
<html>
<body>
​
<?php
$str = "abc ABC";
$pattern = "/((a)b)(c)/i";
if(preg_match_all($pattern, $str, $matches, PREG_PATTERN_ORDER)) {
  print_r($matches);
}
?>
​
</body>
</html>
​
Array
(
    [0] => Array
        (
            [0] => abc
            [1] => ABC
        )

    [1] => Array
        (
            [0] => ab
            [1] => AB
        )

    [2] => Array
        (
            [0] => a
            [1] => A
        )

    [3] => Array
        (
            [0] => c
            [1] => C
        )

)