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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