October 2022
Beginner to intermediate
390 pages
7h 5m
Chinese
Content preview from Perl语言入门（第8版）
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156
｜
第
8
章
abc #
这其实不是注释！
123
]
/xx
请注意，
/xx
允许范围内的空格。虽然其中有一个空格，它仍然是一个范围：
use v5.26;
/[0 - 9]/xx #
还是代表数字
联合使用修饰符
如果需要对单次匹配使用多项修饰符，只需要把它们接在一起写在末尾，前后顺序无
关：
if (/barney.*fred/is) { #
同时使用
/i
和
/s
print "That string mentions Fred after Barney!\n";
}
或者像下面这样展开后并带注释的写法：
if (m{
barney #
小伙子
barney
.* #
夹在中间的不管什么字符
fred #
大嗓门的
fred
}six) { #
同时使用
/s
、
/i
和
/x
print "That string mentions Fred after Barney!\n";
}
注意，我们用花括号作为定界符，这样程序员专用的编辑器就可以根据配对的花括
号，快速把定位光标从正则表达式的开头跳至末尾。
选择字符的解释方式
Perl 5.14
开始增加了一些用于告诉
Perl
如何解释字符意义的修饰符，着重于两个重要
方面：对大小写的处理以及对字符集简写的阐释。本节所有内容仅适用于
Perl 5.14
及
后续版本。
修饰符
/a
告诉
Perl
对字符集采取
ASCII
方式解释，修饰符
/u
表示以
Unicode
方式
解释，修饰符
/l
则表示根据本地化语言的设定，用对应的字符集编码作解释。如果 ...
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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.
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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.