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<?php
 
$data = 
    preg_match_all('/<(\S+)>\s->\s<\1>/', file_get_contents('php://stdin'), $m)
    ? $m[1]
    : array()
;
print_r($data);

Success #stdin #stdout 0.01s 20520KB

stdin

copy

<a@b> -> <c@d>, <e@f> -> <e@f>, 
<g@h> -> <g@h>, <i@j> -> <i@j>,
<k@l> -> <m@n>,

stdout

copy

Array
(
    [0] => e@f
    [1] => g@h
    [2] => i@j
)

https://ideone.com/vCd5Q7

language:

PHP (php 7.3.5)

created:

visibility:

secret

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