Thanks for that Scott, I hadn't read up on parse, but I will do now. Stuart
> ------------Original Message------------ > From: "Jones, Scott" <[EMAIL PROTECTED]> > To: <[EMAIL PROTECTED]> > Date: Thu, Apr-29-2004 7:36 PM > Subject: [REBOL] Re: Parsing out strings > > > From: ML > ... > > Suppose the line I am parsing says: > > "the user jsmith logged in at 4.30pm" > > > > Can you give me a clue what I would use to > > parse in each of these circumstances where > > the desired text is: > > > > 1. "the user" > > 2. "the user jsmith" > > 3. "jsmith" > > 4. "jsmith logged in at 4.30pm" > > 5. "logged in at 4.30pm" > > Hi, Stuart, > > You will get a hundred ways to do this. In order to illustrate the more general > principles, I offer the following ways (watch for line wrap). The first is a bit > "brute force": > > data: "the user jsmith logged in at 4.30pm" > parse-bits: parse data none > probe rejoin [parse-bits/1 " " parse-bits/2] > probe rejoin [parse-bits/1 " " parse-bits/2 " " parse-bits/3] > probe parse-bits/3 > probe rejoin [parse-bits/3 " " parse-bits/4 " " parse-bits/5 " " parse-bits/6 " " > parse-bits/7] > probe rejoin [parse-bits/4 " " parse-bits/5 " " parse-bits/6 " " parse-bits/7] > > This first method relies on the fact of the number of words of each record in the > log remain the same. The second method is more rule based, and it copies sections > based on the rules: > > data: "the user jsmith logged in at 4.30pm" > parse/all data [ > copy p1 > thru "the user" > copy p2 > to "logged" > copy p3 > to end > ] > trim p2 > print [p1 p2 p3] > > and finally a variation that demonstrates a slightly different way with more parse > commands: > > data: "the user jsmith logged in at 4.30pm" > parse/all data [ > copy p1 > thru "the user" > skip > copy p2 > to " " > skip > copy p3 > to end > ] > print [p1 p2 p3] > > Hope that helps get you started on the REBOL ways to parse. > > --Scott Jones > > -- > To unsubscribe from this list, just send an email to > [EMAIL PROTECTED] with unsubscribe as the subject. > > > > -- To unsubscribe from this list, just send an email to [EMAIL PROTECTED] with unsubscribe as the subject.
