[bug #23535] Grep Doesn't Support \t as a tab character

[Benno Schulenberg]

Follow-up Comment #1, bug #23535 (project grep):

It is not entirely clear how exactly you are searching for tabs.  It would
have been better to provide actual examples, pasting them together with their
output.  For example:

$ echo -e "t : words" | grep 't'
$ echo -e "t : words" | grep $'t'
         : words
$ echo -e "t : words" | sed 's/t/xx/'
xx : words

In 'info sed' there is this:

`CHAR' [...]
    Note that the only C-like backslash sequences that you
    can portably assume to be interpreted are `n' and `\';
    in particular `t' is not portable, and matches a `t'
    under most implementations of `sed', rather than a tab
    character.

Nowhere in 'info grep' I see mention of "t", so grep's regular expressions
apparently do not support it -- possibly to avoid problems when porting
scripts.

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