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        // A regular domain name.
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        // A regular domain name.
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        // This doesn't match I18N domain names, but we don't have proper IRI support,
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        // This doesn't match I18N domain names, but we don't have proper IRI support,
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        // so force users to insert Punycode.
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        // so force users to insert Punycode.
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        // There is not a good sense in which underscores should be
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        // Underscores defined as Unreserved Characters in RFC 3986 are
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        // allowed, since it's technically not! (And if you go as
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        // far to allow everything as specified by the DNS spec...
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        // well, that's literally everything, modulo some space limits
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        // for the components and the overall name (which, by the way,
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        // we are NOT checking!).  So we (arbitrarily) decide this:
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        // allowed in a URI. There are cases where we want to consider a
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        // let's allow underscores wherever we would have allowed
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        // URI containing "_" such as "_dmarc.example.com".
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        // hyphens, if they are enabled.  This is a pretty good match
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        // for browser behavior, for example, a large number of browsers
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        // cannot handle foo_.example.com, but foo_bar.example.com is
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        // Underscores are not allowed in the default. If you want to
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        // fairly well supported.
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        // allow it, set Core.AllowHostnameUnderscore to true.
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        $underscore = $config->get('Core.AllowHostnameUnderscore') ? '_' : '';
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        $underscore = $config->get('Core.AllowHostnameUnderscore') ? '_' : '';
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        // Based off of RFC 1738, but amended so that
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        // Based off of RFC 1738, but amended so that
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        // as per RFC 3696, the top label need only not be all numeric.
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        // as per RFC 3696, the top label need only not be all numeric.
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        // The productions describing this are:
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        // The productions describing this are:
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        $a   = '[a-z]';     // alpha
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        $a   = '[a-z]';     // alpha
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        $an  = '[a-z0-9]';  // alphanum
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        $an  = "[a-z0-9$underscore]";  // alphanum
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        $and = "[a-z0-9-$underscore]"; // alphanum | "-"
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        $and = "[a-z0-9-$underscore]"; // alphanum | "-"
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        // domainlabel = alphanum | alphanum *( alphanum | "-" ) alphanum
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        // domainlabel = alphanum | alphanum *( alphanum | "-" ) alphanum