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@ 2023-05-14T13:12:04Z

<?php

$strings = [
    "1 800-555-1111",
    "1 222-555-1111",
    "888-555-1111",
    "1 888 555 1111",
    "1 ",
    "1 2"
];
$pattern = '/^1\h+(?=\d(?:[^\d\n\r]?\d){9}$)/';
foreach ($strings as $s) {
    echo preg_replace($pattern, '', $s) . PHP_EOL;
}

Output
Performance
VLD
References
Branches

preg_replace: documentation ( source)

preferences:dark modelive previewkey bindings

28.01 ms | 404 KiB | 5 Q