how to write a ''multiple characters' macro character' ?

Hi,

In CLtL, there is an example of how to write the colon (comment)
character macro.
In place of the colon, I'd like to use, say, two dashes, i.e. '--'.
My idea is to use a dispatch macro character on the first dash. If the
following character is also a dash, then it's a comment, else, treat
the whole thing 'normally'.

1/ Is-it the correct way to go ?
2/ What if it was three dashes (and not only two) ? The statement 'the
following' is now 'the following two'...
3/ How to treat the 'whole thing normally' ?

Thanks, and happy new year :)
--thu

.

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