sed bug

[Duane Dombrowski]

Actually this appears to be a bug in regexp (e.g., problems are observed in 
both grep and sed).
Character range specifications seem to be broken.
They  seem to exclude certain characters:

echo "ab-" | sed "s/[ -z]/x/g"
produces
xx-
where it should produce
xxx

And they don't seem to recognize some valid end of range characters:
echo "abc" | sed "s/[ -~]/x/g"
produces
abc
where it should produce
xxx

The equivalent, but longer, regexp produces the expected output
echo "abc" | sed "s/[ -z{|}~]/x/g"
xxx



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