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| regex-newline_sensitive |
.
and a negated bracket expression such as [^a] do not match
a newline, so a match does not cross the end of a line unless the
pattern contains a newline explicitly. This is the expected behaviour
for a pattern typed by the user, as in PceEmacs search and replace. The
default is @off,
which allows patterns to span lines. Independent of this setting, ^
and $ match at the start and end of each line.