D23190: [take over] Add helpful buttons (mainly) for the Regular Expressions switch

[Christoph Cullmann]

cullmann added a reviewer: gregormi.

REPOSITORY
  R40 Kate

REVISION DETAIL
  https://phabricator.kde.org/D23190

To: mickaelbo, #kate, ngraham, gregormi
Cc: cullmann, kwrite-devel, domson, michaelh, ngraham, demsking, sars, dhaumann
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