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<?php $body = "This question is a {{x}} of {{y}} within SO."; $text = ['possible duplicate', '@21100035']; echo preg_replace_callback('~{{[^{}]++}}~', function($m) use ($text, &$count) { return $text[(int)$count++] ?? $m[0]; }, $body, -1, $count);
Output for git.master_jit, git.master, rfc.property-hooks
This question is a possible duplicate of @21100035 within SO.

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