sed - bug in error message

[Hisham Muhammad]

Hello,

sed 4.1.4 is giving an inaccurate error message:

$ echo 'hello' | sed 's/h\(e\)llo/\2/'
sed: -e expression #1, char 15: invalid reference \3 on `s' command's RHS

That should be of course "invalid reference \2".

A simple one-line change (patch attached) fixes this off-by-one.

Thanks,

-- Hisham

sed-4.1.4-error-message.patch
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