function wp_kses_bad_protocol_once($string, $allowed_protocols, $count = 1)
{
    $string2 = preg_split('/:|&#0*58;|&#x0*3a;/i', $string, 2);
    if (isset($string2[1]) && !preg_match('%/\\?%', $string2[0])) {
        $string = trim($string2[1]);
        $protocol = wp_kses_bad_protocol_once2($string2[0], $allowed_protocols);
        if ('feed:' == $protocol) {
            if ($count > 2) {
                return '';
            }
            $string = wp_kses_bad_protocol_once($string, $allowed_protocols, ++$count);
            if (empty($string)) {
                return $string;
            }
        }
        $string = $protocol . $string;
    }
    return $string;
}

/**
 * Sanitizes content from bad protocols and other characters.
 *
 * This function searches for URL protocols at the beginning of $string, while
 * handling whitespace and HTML entities.
 *
 * @since 1.0.0
 *
 * @param string $string Content to check for bad protocols
 * @param string $allowed_protocols Allowed protocols
 * @return string Sanitized content
 */
function wp_kses_bad_protocol_once($string, $allowed_protocols)
{
    $string2 = preg_split('/:|&#0*58;|&#x0*3a;/i', $string, 2);
    if (isset($string2[1]) && !preg_match('%/\\?%', $string2[0])) {
        $string = wp_kses_bad_protocol_once2($string2[0], $allowed_protocols) . trim($string2[1]);
    }
    return $string;
}

/**
 * Sanitizes content from bad protocols and other characters.
 *
 * This function searches for URL protocols at the beginning of $string, while
 * handling whitespace and HTML entities.
 *
 * @since 1.0.0
 *
 * @param string $string Content to check for bad protocols
 * @param string $allowed_protocols Allowed protocols
 * @return string Sanitized content
 */
function wp_kses_bad_protocol_once($string, $allowed_protocols)
{
    global $_kses_allowed_protocols;
    $_kses_allowed_protocols = $allowed_protocols;
    $string2 = preg_split('/:|:|:/i', $string, 2);
    if (isset($string2[1]) && !preg_match('%/\\?%', $string2[0])) {
        $string = wp_kses_bad_protocol_once2($string2[0]) . trim($string2[1]);
    } else {
        $string = preg_replace_callback('/^((&[^;]*;|[\\sA-Za-z0-9])*)' . '(:|:|&#[Xx]3[Aa];)\\s*/', 'wp_kses_bad_protocol_once2', $string);
    }
    return $string;
}