Email list hosting service & mailing list manager

repeating patterns and ... Michael Montague (17 Oct 2013 03:31 UTC)
Re: repeating patterns and ... Peter Bex (17 Oct 2013 07:03 UTC)

Re: repeating patterns and ... Peter Bex 17 Oct 2013 07:01 UTC

On Wed, Oct 16, 2013 at 08:31:54PM -0700, Michael Montague wrote:
> Scheme already has one way of specifying repeating patterns: ... How
> about using similar syntax for regular expressions?
>
> (* <sre>) would change to (<sre> ...)

That's a nice alternative syntax!  However,

> The general case of (** <from> <to> <sre>) could change to (<sre> ...
> <from> <to>)
>
> or to (<sre> (... <from> <to>))
>
> (? <sre>) changes to (<sre> ... 0 1) or to (<sre> (... 0 1))
> (+ <sre>) changes to (<sre> ... 1) or to (<sre> (... 1))

This is rather ugly IMO.  Also, more generally speaking, the
symbols that SRE uses are "operators", which for generality's sake
should all be in operator position.  That would also make it slightly
easier to compile due to being more general.

Cheers,
Peter
--
http://www.more-magic.net