Fix region regexes incorrectly matching ^$ at end of line

Because no flags were set for regex matching, the regex engine was
assuming that the subject string past-the-end matched a end-of-line.
As the subject string already ended with a \n character, the regex
engine processing of the "past-the-end" position would match '^$'
as ^ matched past the existing \n and $ matched the assumed
end-of-line.

Fixes #3799

0 files changed, 0 insertions, 0 deletions