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@ 2020-11-23T03:42:09Z

<?php

$ubbText = <<<TEXT
[b]Hey[/b]
[b]Hello[/b]
TEXT;

$counter = 0;
do {
    $ubbText = preg_replace(
        "~\[b](.*?)\[/b]~si",
        '<span class="b">' . (++$counter) . '. $1</span>',
         $ubbText,
         1,
         $count
     );
} while ($count);
echo $ubbText;

Output
Performance
VLD
References
Branches

preg_replace: documentation ( source)

preferences:dark modelive previewkey bindings

33.18 ms | 404 KiB | 5 Q