<?php $test = 'YO_{ YO_{ YO_{ McDonalds. } } }';; $test = preg_replace_callback($p = '/YO_\{(.*)\}/s', $f = function($matches) use (&$f, &$p) { return preg_match($p, $matches[1]) ?trim(preg_replace_callback($p, $f, $matches[1])) :$matches[1]; }, $test); echo $test;
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