Glenn L McGrath f36635cec6 Fix the following testcase by disabling global substitution if the regex
is anchored to the start of line, there can be only one subst.
echo "aah" | sed 's/^a/b/g'
2003-09-13 15:12:22 +00:00
..
2003-03-19 09:13:01 +00:00
2003-03-19 09:13:01 +00:00