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<?php
 
$input = '{a{b{c{d}}}}';
preg_match_all('/(?:^(?=({\w+(?1)?})$)|\G(?!\A)){(\w+)/', $input, $matches);
print_r($matches[2]);

Success #stdin #stdout 0.01s 82944KB

stdin

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Standard input is empty

stdout

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Array
(
    [0] => a
    [1] => b
    [2] => c
    [3] => d
)

https://ideone.com/UKTfcm

language:

PHP (php 7.3.5)

created:

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public

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