From: gotoken@... (GOTO Kentaro)
Date: 2000-12-31T18:27:03+09:00
Subject: [ruby-talk:8386] Re: substitution / Ruby's RegExp's

In message "[ruby-talk:8385] substitution / Ruby's RegExp's"
    on 00/12/31, Jens Luedicke <jens@irs-net.com> writes:
>My problem is that I want to replace every occurance 
>of a pattern in an array...
>
>for i in file 
>	i =~ # substitution here
>end
>
>A Perl-Style substitution like: 
>
>	s/old/new/g;
>
>doesn't work and Ruby's Reference/Tutorial 
>wasn't helpful at all to me. 

String#gsub! is a way.  For example:

  for line in file
    line.gsub!(old, new)
  end

where old is a string or a regular expression. 

In Ruby, every data manipulation is archived by a method, e.g., even
the matching operator =~ is a special form of method invocaion, and we
denote it by String#=~ (=~ method of String class) or Regexp#=~ (=~ of
Regexp).  When I would like to know how to do something against an
object, so, I check out the reference manual about the class of the
object or its operand.

Hope this helps,

-- Gotoken