Perl - 正規表現によるマッチ(丸括弧とマッチ変数)

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)
• BBEdit - Bare Bones Software, Inc., Emacs(Text Editor)
• プログラミング言語: 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)の8.10(練習問題)3を解いてみる。

その他参考書籍

• プログラミングPerl〈VOLUME1〉
• プログラミングPerl〈VOLUME2〉
• Perlクックブック〈VOLUME1〉
• Perlクックブック〈VOLUME2〉

3.

コード(BBEdit)

sample.pl

#!/usr/bin/env perl
use strict;
use warnings;
use 5.016;
use utf8;
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'
$

ちなみにpython3.3の場合。

コード(BBEdit)

sample.py

#!/usr/bin/env python3.3
#-*- coding: utf-8 -*-

import re, sys

for line in sys.stdin:
    line = line.rstrip()
    res = re.search(r"(\b\w*a\b)", line)
    if res:
        print("Matched : |{0}<{1}>{2}|".format(
            line[0:res.start()], res.group(), line[res.end():]))
        print("group(1) contains '{0}'".format(res.group(1)))
    else:
        print("No match: |{0}|".format(line))

入出力結果(Terminal)

$ ./sample.py < test.txt
No match: |A|
Matched : |<a>|
group(1) contains 'a'
Matched : |<kamimura>'s blog|
group(1) contains 'kamimura'
Matched : |http://<sitekamimura>.blogspot.com|
group(1) contains 'sitekamimura'
No match: |KMI|
Matched : |http://www.<mkamimura>.com|
group(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>|
group(1) contains 'wilama'
No match: |barney|
Matched : |<wilma> and fred|
group(1) contains 'wilma'
Matched : |fred and <wilma>|
group(1) contains 'wilma'
Matched : |<Wilma> and Fred|
group(1) contains 'Wilma'
Matched : |Fred and <Wilma>|
group(1) contains 'Wilma'
Matched : |<wilma>&fred|
group(1) contains 'wilma'
Matched : |Mrs. <Wilma> Flintstone|
group(1) contains 'Wilma'
Matched : |I saw <Wilma> yesterday|
group(1) contains 'Wilma'
Matched : |I, <Wilma>!|
group(1) contains 'Wilma'
No match: |Z|
Matched : |<llama>|
group(1) contains 'llama'
$