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@ 2021-04-23T10:32:36Z

<?php

$strs = [' 2,564.30', '-2,564.30'];
print_r(preg_replace('~^-\K|[^-\d.]~', '', $strs));

Output
Performance
VLD
References
Branches

print_r: documentation ( source)

preferences:dark modelive previewkey bindings

54.95 ms | 1371 KiB | 5 Q