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@ 2019-04-24T08:55:03Z

<?php

$str = '{code}var a = 1;{code} then, {noformat}a = 5;{noformat} and, {code}a -= 4;{code}';
$codePatterns = [
    '/{code}(.*?){code}/',
    '/{noformat}(.*?){noformat}/'
];

echo preg_replace($codePatterns, '<code>$1</code>', $str);

Output
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preg_replace: documentation ( source)

preferences:dark modelive previewkey bindings

25.49 ms | 404 KiB | 5 Q