There is one filter per option name; the $option in the filter name stands for the name (e.g. ‘sanitize_option_blogname‘, ‘sanitize_option_siteurl‘). You can use this filter to define a sanitizer for your own options. See the notes for sanitize_option() for a list of existing options.

Filter existing options

add_filter('sanitize_option_admin_email', 'sanitize_builtin_option', 10, 2);
add_filter('sanitize_option_new_admin_email', 'sanitize_builtin_option', 10, 2);

function sanitize_builtin_option($value, $option) {
    //...
}

Filter your own options

add_filter('sanitize_option_feed_url', 'sanitize_url', 10, 2);
add_filter('sanitize_option_wpi_endpoint', 'sanitize_url', 10, 2);
add_filter('sanitize_option_contact_email', 'sanitize_email');

function sanitize_url($value, $option) {
    //...
}

function sanitize_email($value, $option) {
    //...
}