January 2018
Intermediate to advanced
408 pages
9h 18m
Japanese
Content preview from 初めてのPerl 第7版
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133
7.6 選択肢
7.6
選択肢
縦棒（バー、
|
）は、その左側か右側のどちらか一方にマッチするという意味になります。しば
しばこの縦棒は「オア」（
or
：「または」の意）と呼ばれます。つまり、縦棒の左側の部分がマッチ
しなかったら、右側の部分にマッチのチャンスが与えられるのです。
foreach ( qw(fred betty barney dino) ) {
if ( /fred|barney/ ) {
print "$_ matched\n";
}
}
上を実行すると
2
つの名前が出力されます。
1
つは左の選択肢にマッチしたもので、もう
1
つは
右の選択肢にマッチしたものです。
fred
barney
選択肢はもっと増やすことができます。
foreach ( qw(fred betty barney dino) ) {
if ( /fred|barney|betty/ ) {
print "$_ matched\n";
}
}
今度は
3
つの名前が出力されます。
fred
betty
barney
選択肢によってパターンは右側と左側に分割されますが、あなたの期待通りにならないことが
あります。
Flintstones
の誰かにマッチさせたいが、名前は
Fred
でも
Wilma
でも構わないという
ケースを考えてみます。あなたは次のコードを書くかもしれません。
$_ = "Fred Rubble";
if( /Fred|Wilma Flintstone/ ) { #
期待していない形でマッチしてしまう
print "It matched!\n"; ...
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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.