From: sukhchander <sukhchander@...>
Date: 2006-08-13T05:30:17+09:00
Subject: Re: Regexp Parsing -- What's the right way?

Hi Simon,

That's pretty cool.
I was looking for a utility similar to Java's StringTokenizer. You just
pointed it out.
Ruby has so many things built in. It's very comprehensive.

For larger regexp I assume you prefer the split/tokenize method?

I went with the Regexp approach because it occurred to me first.

Thanks.
[sukhchander]

Simon Kr�ger wrote:
> skelastic@gmail.com wrote:
> > Greetings,
> >
> > I'm trying to parse the following line:
> >
> > "00608 P 135 001 LEC Tu 2-5P 210 WHEELER Information Tech and Soceity 3
> > LAGUERRE"
> >
> > i've constructed the following regexp:
> > /(\d{5}).(\D\s\w{2,4}).(\d{1,4}\s\D{3}).(\D{1,4}\s\d+).*(\d{1,4}\s\D{1,9}).(\w+).*(\d?).*(\w{1,14}).*/
> >
> > with a input file i've successfully produced the following output:
> > control# 00608                     ---- correct
> > course#: P 135                     ---- correct
> > section#: 001 LEC                     ---- correct
> > day-hour#: Tu 2                     ---- missing '-5P
> > room#: 3 LAGUERRE,           ---- should be 210 WHEELER
> > course-name#: M                  --- IT and Soceity
> > credits#:                               --- should be 3
> > prof#: 5                                 --- should be LAGUERRE
> >
> > i'm a novice to ruby and regexp. i would like to know if i'm taking the
> > right approach.
> > i'll eventually nail it but any hints or suggestions would be useful.
> >
> > appreciate the help.
>
> I would go with split in this case:
>
> t = "00608 P 135 001 LEC Tu 2-5P 210 WHEELER Information Tech and Soceity 3
> LAGUERRE"
> a = t.split
> #strip from the beginning
> control = a.shift
> course = a.shift + ' ' + a.shift
> section = a.shift + ' ' + a.shift
> hour = a.shift + ' ' + a.shift
> room = a.shift + ' ' + a.shift
> #strip from behind
> prof = a.pop
> credits = a.pop
> #the rest is the name
> coursen = a.join(' ')
>
> puts "control: #{control}"
> puts "course: #{course}"
> puts "section: #{section}"
> puts "hour: #{hour}"
> puts "room: #{room}"
> puts "coursen: #{coursen}"
> puts "credits: #{credits}"
> puts "prof: #{prof}"
> 
> cheers
> 
> Simon