Fix incorrect regexs for string in backend highlighters
Summary: Now string highlighter regex highlighte two strings, standing neary, as one string, that incorrect. So it fix it.
Test Plan:
- Open Octave, Scilab, Lua, Sage session, write '3', '4', '5'
- Make sure, that string highlighting wrong.
- Appy the patch
- Test again and check, that all okay
Reviewers: Cantor, asemke
Differential Revision: https://phabricator.kde.org/D12052