Port the search interface from QRegExp to QRegularExpression (!7) · Merge Requests · Frameworks / KTextEditor

Port the search interface from QRegExp to QRegularExpression

Remove the kateregexp class:
- Move isMultiLine() and repairPattern() to kateregexpsearch; merge them into one function
- Dot '.' character will match any character except a newline by default
Explicitly enable QRegularExpression::MultilineOption, for the rationale see the comment at the top of KateRegExpSearch::search()
KateCommands::SedReplace::InteractiveSedReplacer::InteractiveSedReplacer() was updated to use QRegularExpression, but not tested
Adjust the extended context menu used in the find box:
- QRegularExpression supports positive/negative fixed-length lookbehind
- \x.... escape sequences must be wrapped in curly braces if more than two hex digits is used, so it's better to just always wrap \x escape sequencess in curly braces (QRegularExpression upstream recommendation), c.f.:
  - https://phabricator.kde.org/D26123#inline-147157
  - https://perldoc.perl.org/perlre.html
Tweak/extend the relevant unit tests (searchbar_test, regexpsearch_test)
All unit tests pass except for these ones (which fail on master too): kateindenttest_testCppstyle (Child aborted) kateindenttest_testPascal (Child aborted) bug313759 (Child aborted)

- Remove the kateregexp class:
  - Move isMultiLine() and repairPattern() to kateregexpsearch; merge
    them into one function
  - Dot '.' character will match any character except a newline by default

- Explicitly enable QRegularExpression::MultilineOption, for the rationale
  see the comment at the top of KateRegExpSearch::search()
- KateCommands::SedReplace::InteractiveSedReplacer::InteractiveSedReplacer()
  was updated to use QRegularExpression, but not tested

- Adjust the extended context menu used in the find box:
   - QRegularExpression supports positive/negative fixed-length lookbehind
   - \x.... escape sequences must be wrapped in curly braces if more than
     two hex digits is used, so it's better to just always wrap \x escape
     sequencess in curly braces (QRegularExpression upstream recommendation),
     c.f.:
       - https://phabricator.kde.org/D26123#inline-147157
       - https://perldoc.perl.org/perlre.html

- Tweak/extend the relevant unit tests (searchbar_test, regexpsearch_test)

- All unit tests pass except for these ones (which fail on master too):
   kateindenttest_testCppstyle (Child aborted)
   kateindenttest_testPascal (Child aborted)
   bug313759 (Child aborted)

Port the search interface from QRegExp to QRegularExpression

Check out, review, and merge locally