SynrEdit: regex, clean up, issue 0024700

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@42153 4005530d-fff6-0310-9dd1-cebe43e6787f
SynEdit: regex, clean up, issue 0024700 / partly reverted

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@42154 4005530d-fff6-0310-9dd1-cebe43e6787f