January 2018
Intermediate to advanced
408 pages
9h 18m
Japanese
Content preview from 初めてのPerl 第7版
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.
173
9.5 より強力な正規表現機能
ファイル名を付けます。
open FILE, $filename
or die "Can't open '$filename': $!";
my $lines = join '', <FILE>;
$lines =~ s/^/$filename: /gm;
9.5.4
たくさんのファイルを更新する
プログラムを使ってテキストファイルを更新する際によく使われるテクニックは、元ファイルの
内容をもとに別ファイルを新たに作り、その際に必要に応じて内容に変更を加える、というもので
す。これから説明するように、このテクニックを使えば、ファイルそのものを更新するのとほとん
ど同じ結果が得られますが、いくつかの有用な副作用もあります。
今から説明する例では、同じようなフォーマットのファイルが数百個あったとしましょう。その
1
つであるファイル
fred03.dat
の内容を全部示すと次のようになります。
Program name: granite
Author: Gilbert Bates
Company: RockSoft
Department: R&D
Phone: +1 503 555-0095
Date: Tues March 9, 2004
Version: 2.1
Size: 21k
Status: Final beta
このファイルを修正して、情報の一部を変えたいものとしましょう。修正後は、次のような感じ
になります。
Program name: granite
Author: Randal ...
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
and much more.
Read now
Unlock full access
More than 5,000 organizations count on O’Reilly
O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.