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@ 2023-09-08T07:36:17Z

<?php

$strs = explode("\n", '21
14"
14"
14

16"');
foreach ($strs as $str) {
    echo preg_replace('/(?<=\d)$/', '"', $str) . "\n";
}

Output
Performance
VLD
References
Branches

explode: documentation ( source)
preg_replace: documentation ( source)

preferences:dark modelive previewkey bindings

105 ms | 405 KiB | 5 Q