Question

How to check if a string is in a valid format ("XXX-XXX-XXXX") with numbers in PHP

Answer 1

function isValidFormat($s) {
    $pattern = "/^(\\d{3}-)?\\d{3}-\\d{4}$/";
    
    return preg_match($pattern, $s) === 1;
}

$s = "771-290-1652";
if (isValidFormat($s)) {
    echo "Valid\n";
} else {
    echo "Not Valid\n";
}

$s = "771-29-162";
if (isValidFormat($s)) {
    echo "Valid\n";
} else {
    echo "Not Valid\n";
}

$s = "771-AB1-1620";
if (isValidFormat($s)) {
    echo "Valid\n";
} else {
    echo "Not Valid\n";
}



/*
run:

Valid
Not Valid
Not Valid

*/

 

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