How can I properly check a string format if it follows a version number format?

manpreet Best Answer 2 years ago

I have a PHP app that get's a play store app data and I want to check if the data I am getting is the version number.

A version number can be 0.0.1 to 99.99.99.

How can I properly use regular expressions to handle this job?

This is how I currently do it:

if (checkIfValidVersion($someString)) {
    echo "valid version!";
}

function checkIfValidVersion ($someString) {
    $split = explode(".", $someString);
    $isValid = false;

    foreach($split as $s) {
        if (is_numeric($s)) {
            $isValid = true;
        } else {
            $isValid = false;
        }
    }

    return $isValid;
}

manpreet 2 years ago

^(\d?\d)\.(\d?\d)\.(\d?\d)$

preg_match("/^(\d?\d)\.(\d?\d)\.(\d?\d)$/", "1.0.0"); // Match
preg_match("/^(\d?\d)\.(\d?\d)\.(\d?\d)$/", "99.99.99"); // Match
preg_match("/^(\d?\d)\.(\d?\d)\.(\d?\d)$/", "99.699.99"); // Not match