How to get only the URL of nextpage (without tag)

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If you check out the source of _wp_link_page, you’ll see all the URL calculations are coded directly within – you can either lift this code straight out into your own function, or sprinkle a little regex around the existing function:

function wpse_204737_get_post_page_url( $i ) {
    if ( preg_match( '/href="https://wordpress.stackexchange.com/questions/204737/([^"]+)"https://wordpress.stackexchange.com/", _wp_link_page( $i ), $match ) )
        return $match[1];
}

Worth noting that _wp_link_page is a “private” function, and is not intended for use in 3rd party plugins & themes – it may be renamed/removed/deprecated in a subsequent release.

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