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@ 2016-06-14T09:43:53Z

<?php

$str = 'fdfqsdfqsdf%A%2%B%4%C%D%7sddsdfsdf';
$res = preg_replace_callback(',%.?,', function (array $matches) {
    if (preg_match(',%\d+,', $matches[0])) {
        return 'FOO';
    }
});
echo $res;

$res = preg_replace_callback(',%\d+?,', function (array $matches) {
    return 'FOO';
});
echo $res;

Output
Performance
VLD
References
Branches

preg_replace_callback: documentation ( source)
preg_match: documentation ( source)

preferences:dark modelive preview

29.37 ms | 402 KiB | 5 Q