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How to check for duplicate values in Meta Box before publishing?

  • How to achieve the below scenario?

    I have a created a meta box named Links with the plugin More Fields in Post type POST, where it will be filled with a website URL.

    When i create a new post, if the entered url in the meta box Links is a duplicate value then i need to be warned before publishing, so that i can change the link thus avoiding any duplicate values.

    Your help will be highly appreciated. Please find the below image for reference.

    http://i44.tinypic.com/2wd1uz5.png

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