- print_r: documentation ( source)
- preg_match_all: documentation ( source)
<?php
$s = 'q|aaa/aaa|bbb/bbb|ccc/ccc';
$pattern = '~ (?!\A) \| \K [^|/]+ / [^|/]+ (?: \z (*:END) )? | \A [^|/]+ ~Ax';
if (preg_match_all($pattern, $s, $m) && isset($m['MARK']) ) {
$result = $m[0];
print_r($result);
}