パターンマッチ処理

7,大項目,地域コード,地域識別コード,境域年次(2010),境域年次(2000),,人口　総数,人口　男,人口　女,世帯数　総数,世帯数　一般世帯,世帯数　施設等の世帯
11,,6201,2,2010,2000,山形市,254244,121433,132811,96560,96425,135
12,,6202,2,2010,2000,米沢市,89401,43953,45448,33013,32920,93
13,,6203,2,2010,,鶴岡市,136623,64846,71777,45514,45395,119
20,,6204,2,2010,,酒田市,111151,52610,58541,38955,38860,95
25,,6205,2,2010,2000,新庄市,38850,18432,20418,12980,12958,22
26,,6206,2,2010,2000,寒河江市,42373,20497,21876,12717,12702,15
27,,6207,2,2010,2000,上山市,33836,16036,17800,10751,10709,42
28,,6208,2,2010,2000,村山市,26811,12846,13965,7865,7860,5
29,,6209,2,2010,2000,長井市,29473,14211,15262,9269,9228,41
30,,6210,2,2010,2000,天童市,62214,30148,32066,20404,20338,66
31,,6211,2,2010,2000,東根市,46414,22934,23480,14388,14343,45
32,,6212,2,2010,2000,尾花沢市,18955,9138,9817,5332,5320,12
33,,6213,2,2010,2000,南陽市,33658,16025,17633,10567,10538,29

#!/usr/bin/env ruby
# -*- coding: utf-8 -*-

while line=gets
  data = line.chomp.split(",")
  if /\d+/ =~ data[7]			# 第8フィールドが数字の連続なら
    printf("%s,%s\n", data[6], data[7])
  end
end

番号,氏名,ローマ字,所属
1,公益太郎,"KOEKI, Taro",野球部
2,飯森花子,"IIMORI, Hanako",茶道部
3,三川一二三,"MIKAWA, Hifumi",SKIP

#!/usr/bin/env ruby
# -*- coding: utf-8 -*-
require 'csv'			# csvライブラリの利用

CSV.foreach("quoted.csv") do |row|
  puts row.join("|")		# 縦棒(|)でフィールドを区切って出力
end

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To: yuuji@e.koeki-u.ac.jp
Subject: Nice to meet you
From: HIROSE Yuuji <ta01002@e.koeki-u.ac.jp>
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Status:   

はじめまして、こんにちは、
では、さようなら。

おしまい。

-- 
公益太郎

while line=gets
  break if /^$/ =~ line    # 行頭(^)の直後に行末($)で空行を表すパターン
  〜処理〜
end

while line=gets
  break if /^$/ =~ line
  if /^(return-path|from): *(.*)/i =~ then
    from = $1
  end
end

#!/usr/bin/env ruby
# coding: euc-jp
# Parse rfc5322 header and display summary

while line=gets
  break if /^$/ =~ line
  if /^(return-path|from): *(.*)/i =~ line then
    from = $2
  elsif /^subject: (.*)/i =~ line then
    subj = $1
  elsif /^date: (.*)/i =~ line then
    date = $1
  end
end

printf("%s: %sさんからの「%s」というメイルです。\n", date, from, subj)

printf("%4s|%-16s|%-25s|%s\n", *row)

#!/usr/bin/env ruby
# -*- coding: utf-8 -*-
require 'csv'			# csvライブラリの利用

CSV.foreach("quoted.csv") do |row|
  printf("%4s|%-16s|%-25s|%s\n", *row)
end

class String
  require 'kconv'
  if defined?("".force_encoding)
    def toeucbin()
      self.toeuc.force_encoding("binary")
    end
  else
    def toeucbin()
      self.toeuc
    end
  end
end

class IO
  def printf(*args)
    out = sprintf(*(args.collect{|x| x.is_a?(String) ? x.toeucbin : x }))
    print out.toutf8
  end
end

class Object
  def printf(*args)
    if args[0].is_a?(String)
      $stdout.printf(*args)
    else
      port = args.shift
      port.printf(*args)
    end
  end
end

#!/usr/bin/env ruby
# -*- coding: utf-8 -*-
require 'csv'			# csvライブラリの利用
require './kprintf.rb'		# 日本語桁幅揃え(この行を追加)

CSV.foreach("quoted.csv") do |row|
  printf("%4s|%-16s|%-25s|%s\n", *row)
end