請問下面這個 preg_match 的用法怎麼拆解?
/**
* Validate that a hostname (for example $_SERVER['HTTP_HOST']) is safe.
*
* As $_SERVER['HTTP_HOST'] is user input, ensure it only contains characters
* allowed in hostnames. See RFC 952 (and RFC 2181). $_SERVER['HTTP_HOST'] is
* lowercased.
*
* @return
* TRUE if only containing valid characters, or FALSE otherwise.
*/
function drupal_valid_http_host($host) {
return preg_match('/^\[?(?:[a-z0-9-:\]_]+\.?)+$/', $host);
}
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