This is part of the migration of qtbase from QRexExp to
QRegularExpression.
If support for regular expression is disabled, fixed string can
still be used.
[ChangeLog][QtCore][QSslCertificate] Add overload of fromPath that does
not make use of QRegExp and deprecate the QRegExp variant.
Task-number: QTBUG-72587
Change-Id: I507d8941cc7d70166da0948375dc421fe5e7d967
Reviewed-by: Mårten Nordheim <marten.nordheim@qt.io>
49f143e19c