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@ 2022-05-26T09:56:08Z

<?php

$strings = [
    "123A.478",
    "123.48",
    "123AX",
    "--123.46",
    "123A-.46",
    "-123--.46",
    "A-123-.46"
];

$pattern = '/^[^\d\s]+(?=-)|[^\d\s.]+(?!\d)/';

foreach ($strings as $str) {
    echo preg_replace($pattern, "", $str) . PHP_EOL;
}

Output
Performance
VLD
References
Branches

preg_replace: documentation ( source)

preferences:dark modelive previewkey bindings

107.51 ms | 1247 KiB | 5 Q