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Oct 30, 2024 pm 01:04 PM

How to Validate Domain Names in PHP Without Using Regular Expressions?

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/^[a-zA-Z0-9][a-zA-Z0-9\-\_]+[a-zA-Z0-9]$/

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<code class="php">function is_valid_domain_name($domain_name)
{
    // Check if the domain starts with a letter or number
    if (!preg_match('/^[a-zA-Z0-9]/', $domain_name)) {
        return false;
    }

    // Check if the domain contains only alphanumeric characters, hyphens, or periods
    if (!preg_match('/^[a-zA-Z0-9\-\_]+$/', $domain_name)) {
        return false;
    }

    // Check if the domain ends with a letter or number
    if (!preg_match('/[a-zA-Z0-9]$/', $domain_name)) {
        return false;
    }

    return true;
}</code>

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