algebaric operations on a RegEx?

[S P Arif Sahari Wibowo]

On Wed, 15 Apr 2009, Chris F.A. Johnson wrote:
>    Why do you need a one-liner? I can't think of a good reason.

Do something quick from command line, such as normal calculator 
work (add and multiply some numbers), or quick manipulation of 
strings.

Basically, if I need calculator, I fired a perl or ruby one 
liner, and get the result. With command history, it is a very 
efficient procedure (for me).

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