Combining two regular expressions in boost regex

Question

I have two regular expressions which looks up a url and determines if the URL is a silverlight video url

1. URL should have at least one of these extensions any where .isma, .ismv, .isml

   Regex: .ism(a|v|l)

and

1. URL should have the string "/QualityLevels({bitrate})/Fragments(audio={start-time})"

   Regex: /QualityLevels(\d+)/Fragments(\b(audio|video|text)\b=\d+)

How do I combine these two strings into one and make sure that both the conditions are satisfied?

is_silverlight_livestream_url(const char *url)
{
    /*  expecting something that ends with
     *      "xxx.isml/QualityLevels(<bitrate>)/Fragments(<type>=<timecode>)"
     *  on-demand streams have the extension ".ism" instead of ".isml"
     */
    static boost::regex regex(my_regex_str);
    try {
        if (boost::regex_match(url, regex) == true) {
            return true;
        }
    } catch (std::runtime_error e) {
    }
    return false;
}

Santhosh

Answer 1

You would have something like this, where you look for one string, followed by (optional) extra characters (you could be more specific if you know how this URL should look) and then the file extension at the end:

/QualityLevels(\d+)/Fragments(\b(audio|video|text)\b=\d+)(.+?)?.ism(a|v|l)