Fix build with Qt 5.11 (missing QRegExpValidator)

Authored by asturmlechner on Mar 17 2018, 7:41 PM.

Description

Fix build with Qt 5.11 (missing QRegExpValidator)

Reviewers: dantti

Reviewed By: dantti

Subscribers: kde-utils-devel

Differential Revision: https://phabricator.kde.org/D11429