Re: lowercase letters for binaries

[Charles Levert]

* On Monday 2005-11-07 at 21:40:49 +0100, Benno Schulenberg wrote:
> So maybe the 
> following is a better text for 'info grep usage':
> 
> 13. Why is this back-reference failing?
> 
>         echo "ba" | egrep '(a)\1|b\1'
> 
>     This gives no output, because the first alternate '(a)\1' does
>     not match, as there is no "aa" in the input, so the '\1' in the
>     second alternate has nothing to refer back to, meaning it will
>     never match anything.  (The second alternate in this example
>     can only match if the first alternate has matched -- making
>     the second one superfluous.)

I like it.