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Check if string ends with one of the strings from an array

  1. #1
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    Check if string ends with one of the strings from an array

    Hey,

    Here's what I'm trying to do: basically I have a list of subdomains from which I want to extract the root domain.

    Up until now I've used the following steps:
    1. Find the last "." occurence and retrieve what's to the right of it (basically the TLD): "something.example.com" would retrieve ".com"
    2. Repeat step 1 for the string without the result in step 1: "something.example" would retrieve "example"
    3. Concatenate step 2 and step 1 to get root domain: "example.com"

    Here's the problem I've encountered using this method (it's in step 1): trying to retrieve root domain for "something.example.co.uk" would only retrieve ".co.uk"

    I'm not sure if there's a quick way to fix that, other than actually use a list of possible TLDs (including second level), and see if my string ends in one of the TLDs from the list.

    Here's an example:

    Subdomain Result TLD List
    something.example.com .com .com
    abc.letters.co.uk .co.uk .org
    www.comparison.org .org .net
    .co.uk
    .etc

    I wanna put emphasis that the string must end and not just contain the tld, since for the third example, it might retrieve ".com" from ".comparison" instead of ".org".

    So, any ideas on what I can use to solve this (if there's any way I can avoid using a TLD list, that'd be best)?

    Cheers!

  2. #2
    Forum Expert dilipandey's Avatar
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    Re: Check if string ends with one of the strings from an array

    Hi alienss,


    trying to retrieve root domain for "something.example.co.uk" would only retrieve ".co.uk"
    would it be simple extraction of .co.uk from right side of the string ?


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    DILIPandey
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  3. #3
    Forum Guru martindwilson's Avatar
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    Re: Check if string ends with one of the strings from an array

    something like this maybe
    Attached Files Attached Files
    Last edited by martindwilson; 03-15-2013 at 02:15 PM.
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  4. #4
    Forum Guru martindwilson's Avatar
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    Re: Check if string ends with one of the strings from an array

    hmm problem with upload try again oh blast now its doing it ignore this

  5. #5
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    Re: Check if string ends with one of the strings from an array

    Martin yes! That seems to do it. Does the "2^15" lookup value means that the formula will always grab the last occurrence?

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