katedocument: port one last QRegExp to QRegularExpression
This reverts 88107e4f, since now we require Qt 5.12.
Note that QRegularExpression::wildcardToRegularExpression returns a pattern anchored with \A and \z.
katedocument_test still passes.
This reverts 88107e4f, since now we require Qt 5.12.
Note that QRegularExpression::wildcardToRegularExpression returns a pattern anchored with \A and \z.
katedocument_test still passes.