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[REBOL] Re: Find? Copy/Part?

From: volker:nitsch:g:mail at: 18-Jan-2005 23:56

On Tue, 18 Jan 2005 15:05:40 -0200, Carlos Lorenz <[carlos--lorenz--gmail--com]> wrote:
> Ingo, > > Thanks for you reply. > > I dir not think about parse though I can see you solve it using it. > > Parse yet has a not so confortable sintax to me so I try to avoid the > use of it most part of the time. > > I'd like to have something just like I get in Visual Fox Pro. See below: > > * ------------------------------------------ > a = "aaa*aaa*aaa*aaa" > > * gets the second ocurrence of "*" in the string from left to right > pos = at( "*" , a , 2) > > * then asking VFP to grab a piece of the string up to the > * second "*" in the string a > ? left(a,pos) > > * gives the result > aaa*aaa* > * ------------------------------------------- >
Your main problem is, you gave 'parse no chance to be good in your question. ;) if you had given this spec immediate, its easier. because we can drop this ugly position-handling. str: "aaa*bbb*ccc*ddd" parse str[ copy start [ 2 thru "*" ] ] probe start ;== "aaa*bbb*" Or more verbose: parse str[ copy start ; copy stuff in 'start for the following expr. [ 2 thru "*" ; the "regular expression" telling what to include ] ]
> Would it be very nice to have an AT-like native function in > REBOL/Core, don't you think so? >
No :) -- -Volker Any problem in computer science can be solved with another layer of indirection. But that usually will create another problem. David Wheeler