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This loosely validates a field's value to check that it is a URL.
$url = $form_values['submitted_tree']['web_site'];
$urlpattern = '/^(([\w]+:)?\/\/)?(([\d\w]|%[a-fA-f\d]{2,2})+(:([\d\w]|%[a-fA-f\d]{2,2})+)?@)?([\d\w][-\d\w]{0,253}[\d\w]\.)+[\w]{2,4}(:[\d]+)?(\/([-+_~.\d\w]|%[a-fA-f\d]{2,2})*)*(\?(&?([-+_~.\d\w]|%[a-fA-f\d]{2,2})=?)*)?(#([-+_~.\d\w]|%[a-fA-f\d]{2,2})*)?$/';
if (strlen(trim($url)) > 0) {
if(!preg_match($urlpattern, $url)) {
form_set_error('submitted][web_site', t('Website address is invalid.'));
}
};