From: Bertram Scharpf <lists@...>
Date: 2009-08-31T23:27:52+09:00
Subject: Re: text lines manipulation

Hi,

Am Montag, 31. Aug 2009, 20:33:19 +0900 schrieb George George:
>      m=Regexp.new(re,Regexp::IGNORECASE);
>        if m.match(line)
>           int1 = m.match(line)[1];
>           c1   = m.match(line)[2];
>           int2 = m.match(line)[3];
>           puts int1<< c1 << int2
>       end

After `m.match(line)' the match is stored in the $~ global
variable. You don't need to execute it three more times.

$~[1]  is equivalent to  $1.

The `<<' operator modifieds the string `int1'. Better is here the
operator `+'.

It's sure a matter of taste but in general shorter code is easier
to read.

  if line =~ /(\d+)(-)(\d+)/i then
    int1 = $1
    c1   = $2
    int2 = $3
    puts int1 + c1 + int2
  end

This is for the not faint-hearted:

  int1, c1, int2 = *$~.captures

Bertram

-- 
Bertram Scharpf
Stuttgart, Deutschland/Germany
http://www.bertram-scharpf.de