3v4l.org

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<?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 for 7.4.0 - 7.4.33, 8.0.1 - 8.0.30, 8.1.0 - 8.1.34, 8.2.0 - 8.2.30, 8.3.0 - 8.3.30, 8.4.1 - 8.4.18, 8.5.0 - 8.5.3
123.478 123.48 123 -123.46 123.46 -123.46 -123.46
preferences:
101.07 ms | 1247 KiB | 4 Q