Use QRegularExpression instead of deprecated QRegExp

Now it follows closely the definition of wildcard for glob patterns.
The backslash (\) character is not an escape char in this context.
In order to match one of the special characters, place it in square
brackets (for example, [?]).

src/webui/webapplication.cpp

@@ -38,7 +38,7 @@
 #include <QMimeDatabase>
 #include <QMimeType>
 #include <QNetworkCookie>
-#include <QRegExp>
+#include <QRegularExpression>
 #include <QUrl>
 
 #include "base/algorithm.h"
@@ -693,7 +693,7 @@ bool WebApplication::validateHostHeader(const QStringList &domains) const
     // try matching host header with domain list
     for (const auto &domain : domains)
     {
-        QRegExp domainRegex(domain, Qt::CaseInsensitive, QRegExp::Wildcard);
+        const QRegularExpression domainRegex {Utils::String::wildcardToRegexPattern(domain), QRegularExpression::CaseInsensitiveOption};
         if (requestHost.contains(domainRegex))
             return true;
     }