From: Robert Klemme <shortcutter@...>
Date: 2007-12-03T23:22:48+09:00
Subject: Re: string to substring??

2007/12/3, Pat Kiatchaipipat <l3litzer@hotmail.com>:
> I have one string name
>
> message = "5x-2=18"
>
> and I want to create substring or array by this
>
> mesArray[0] = 5
> mesArray[1] = x
> mesArray[2] = -
> ...
>
> this has function?
> how can I make it?

You have that already in your String:

irb(main):001:0> message = "5x-2=18"
=> "5x-2=18"
irb(main):002:0> message[0].chr
=> "5"
irb(main):003:0> message[1].chr
=> "x"
irb(main):004:0> message[2].chr
=> "-"

I am suspecting though that what you really want is a parser for
expressions.  A simplistic version could look like this:

irb(main):005:0> message.scan %r{\d+|\w+|[-+=]}
=> ["5", "x", "-", "2", "=", "18"]

If you want to properly process expressions with brackets etc. you
need a more complex solution.

Kind regards

robert

-- 
use.inject do |as, often| as.you_can - without end