Fix regexp.

git-svn-id: https://svn.r-project.org/R/trunk@66306 00db46b3-68df-0310-9c12-caf00c1e9a41
using vapply() instead of sapply(), notably for logical result

git-svn-id: https://svn.r-project.org/R/trunk@66307 00db46b3-68df-0310-9c12-caf00c1e9a41
revert r66304 (which did considerably more than intended)

git-svn-id: https://svn.r-project.org/R/trunk@66308 00db46b3-68df-0310-9c12-caf00c1e9a41
emacs page-delimiter fix (= intended version of 66304)


git-svn-id: https://svn.r-project.org/R/trunk@66309 00db46b3-68df-0310-9c12-caf00c1e9a41