Perl - 正規表現によるマッチ(マッチ変数、キャプチャ機能)

初めてのPerl 第6版
Randal L. Schwartz,
Tom Phoenix, brian d foy 共著
近藤 嘉雪 翻訳

開発環境

• OS X Lion - Apple(OS)
• TextWrangler(Text Editor) (BBEditの機能制限無料版、light版)
• Script言語:Perl

『初めてのPerl 第6版』(Randal L. Schwartz, Tom Phoenix, brian d foy 共著、近藤 嘉雪 訳、オライリー・ジャパン、2012年、ISBN978-4-87311-567-2) の8章(正規表現によるマッチ)、8.10(練習問題)3を解いてみる。

3.

コード(TextWrangler)

sample.pl

#!/usr/bin/env perl
use strict;
use warnings;
use utf8;
use 5.012;
binmode STDOUT, ':utf8';
binmode STDIN, ':utf8';

while(<>){
  chomp;
  if(/\b(\w*a)\b/){
    print "Matched: |$`<$&>$'|\n";
    print "\$1 contains '$1'\n";
  } else {
    print "No match: |$_|\n";
  }
}

入出力結果(Terminal)

$ ./sample.pl test.txt
No match: |A|
Matched: |<a>|
$1 contains 'a'
Matched: |<kamimura>'s blog|
$1 contains 'kamimura'
Matched: |http://<sitekamimura>.blogspot.com|
$1 contains 'sitekamimura'
No match: |KMI|
Matched: |http://www.<mkamimura>.com   |
$1 contains 'mkamimura'
No match: |Fred|
No match: |FRED|
No match: |fred|
No match: |frederick|
No match: |Alfred|
No match: |fred flintstone|
No match: |Mr. Slate     |
No match: |Mississippi|
No match: |Bamm-Bamm    |
Matched: |<wilama>|
$1 contains 'wilama'
No match: |barney|
Matched: |<wilma> and fred|
$1 contains 'wilma'
Matched: |fred and <wilma>|
$1 contains 'wilma'
Matched: |<Wilma> and Fred      |
$1 contains 'Wilma'
Matched: |Fred and <Wilma>|
$1 contains 'Wilma'
Matched: |<wilma>&fred|
$1 contains 'wilma'
Matched: |Mrs. <Wilma> Flintstone   |
$1 contains 'Wilma'
Matched: |I saw <Wilma> yesterday|
$1 contains 'Wilma'
Matched: |I, <Wilma>!|
$1 contains 'Wilma'
No match: |Z|
Matched: |<llama>|
$1 contains 'llama'
$ cat test.txt
A
a
kamimura's blog
http://sitekamimura.blogspot.com
KMI
http://www.mkamimura.com   
Fred
FRED
fred
frederick
Alfred
fred flintstone
Mr. Slate     
Mississippi
Bamm-Bamm    
wilama
barney
wilma and fred
fred and wilma
Wilma and Fred      
Fred and Wilma
wilma&fred
Mrs. Wilma Flintstone   
I saw Wilma yesterday
I, Wilma!
Z
llama
$