From: "Peña, Botp" <botp@...>
Date: 2008-07-15T20:54:55+09:00
Subject: Re: Extracting range of lines

From: tmarc [mailto:tmarciniak@gmail.com] 
# are there a ruby equivalents to perl's /regex/ .. /regex/ and /
# regex/ ... /regex/ idioms, examples described at
# http://www.unix.com.ua/orelly/perl/cookbook/ch06_09.htm?
# I've been googling around with no relevant results.

try searching for ruby+range+flip+flop

iianm, *that* perl/sed style is being deprecated.

eg,

  File.open("test.txt") do |f|
    while line=f.gets
       p line
    end
  end
  "--first\n"
  "1234\n"
  "456\n"
  "4321\n"
  "654\n"
  "--second\n"
  "546\n"
  "3456\n"
  "5436\n"
  "9879\n"
  "--third\n"
  "1111\n"
  #=> nil

  File.open("test.txt") do |f|
    while line=f.gets
      p line if line =~ /^--second/ .. /^--third/
    end
  end
  "--second\n"
  #=> nil

so you get weird results.

the new ruby syntax is like,

  File.open("test.txt") do |f|
    while line=f.gets
      p line if line =~ /^--second/ .. line =~ /^--third/
    end
  end
  "--second\n"
  "546\n"
  "3456\n"
  "5436\n"
  "9879\n"
  "--third\n"
  #=> nil

hth.
kind regards -botp