Re: simple grep command twister

[Frodo Baggins <thehobbit@altern.org>]

john smith scripsit:
>Hi!
>  mind twister break?
>how to use grep to show all the paladrome words in the linux dictionary?
>
>grep '\(.\)\(.\)\(.\)\3\2\1' \usr\dict\words partly works?

You simply can't. period. palindrome (not palandrome) is a
context-free concept, that is to say you can't express it with regular 
expression. See any good book on compilers or better still forma
languages to understand why.

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