Transition test suite from QRegExp to QRegularExpression
Trojitá's main code has been ported transitioned from the
unmaintained QRegExp to the ‘new’ QRegularExpression. At that
time, the test suite was not yet transitioned to make sure no
bugs entered there and made bugs in the changed code invisible.
This patch transitions the test suite. A literal translation
has been done. So the new functionality of QRegularExpression
has not been used (specifically, multi-line support). This is
left for future patches.
Change-Id: I36a0480349ff348c673d117d228326b83672d4ab