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Regexp to find the subdomain (if any) from $HTTP_HOST - PHP Development

I need help creating a regular expression to find the subdomain in the $HTTP_HOST variable. The domain is always in this form: [url]www.domain.com[/url] or uk.domain.com or domain.com there is no such thing as a sub.sub.sub.domain.com (not in my case, at least) So, I need to find out if the subdomain is empty, "www" or "uk". Can someone help me? Leif...

  1. #1

    Default Regexp to find the subdomain (if any) from $HTTP_HOST

    I need help creating a regular expression to find the subdomain in the
    $HTTP_HOST variable.

    The domain is always in this form:

    [url]www.domain.com[/url]
    or
    uk.domain.com
    or
    domain.com

    there is no such thing as a
    sub.sub.sub.domain.com
    (not in my case, at least)

    So, I need to find out if the subdomain is empty, "www" or "uk".

    Can someone help me?

    Leif
    Leif Wessman Guest

  2. #2

    Default Re: Regexp to find the subdomain (if any) from $HTTP_HOST

    > I need help creating a regular expression to find the subdomain in the
    > $HTTP_HOST variable.
    No need for regular expressions in this case:
    <?php
    $parts = explode(".",$HTTP_HOST);
    $length = count($parts);
    $subdomain = $length>2 ? $parts[$length-3] : "";
    ?>


    Martin


    Martin C. Petersen Guest

  3. #3

    Default Re: Regexp to find the subdomain (if any) from $HTTP_HOST

    Leif Wessman wrote:
    >
    > I need help creating a regular expression to find the subdomain in the
    > $HTTP_HOST variable.
    >
    > The domain is always in this form:
    >
    > [url]www.domain.com[/url]
    > or
    > uk.domain.com
    > or
    > domain.com
    >
    > there is no such thing as a
    > sub.sub.sub.domain.com
    > (not in my case, at least)
    >
    > So, I need to find out if the subdomain is empty, "www" or "uk".
    >
    > Can someone help me?
    >
    > Leif
    Untested:

    $foo = preg_replace("/^(http:\/\/)?([^\.]+)?(\.?domain\.com.*)$", "\$2",
    $HTTP_HOST);
    switch($foo) {
    case "www":
    //statements
    break;
    case "uk":
    //statements
    break;
    case "":
    //statements
    break;
    default:
    echo "Unrecoginzed URL";
    }
    --
    Shawn Wilson
    [email]shawnglassgiant.com[/email]
    [url]http://www.glassgiant.com[/url]
    Shawn Wilson Guest

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