如何匹配空行

发布于 2024-12-20 23:24:29 字数 222 浏览 0 评论 0原文

我正在尝试根据空行拆分变量。变量是

$s = "iSCSI cred number=0
name=match1
string=2
name=number1

iSCSI cred number=1
name=match2
string=3
name=number2

iSCSI cred number=2
name=match3
string=4
name=number3";

原文

I am trying to split the variable based on the blank line. the variable is

$s = "iSCSI cred number=0
name=match1
string=2
name=number1

iSCSI cred number=1
name=match2
string=3
name=number2

iSCSI cred number=2
name=match3
string=4
name=number3";

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冷了相思 2024-12-27 23:24:29

没什么可做的：

my @split_values = split/\n\n/, $s

或者，您可以使用字符串 iSCSI 的正向前瞻来分割多个空白字符：

my @split_values = split/\s+(?=iSCSI)/, $s;

这适用于您的简单情况，无论空白字符是换行符、回车符还是空格。

There's nothing to it:

my @split_values = split/\n\n/, $s

Alternatively you can split on multiple whitespace characters with positive lookahead for the string iSCSI:

my @split_values = split/\s+(?=iSCSI)/, $s;

That works for your simple case, no matter if the whitespace characters are line feeds, carriage returns or spaces.

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泅人 2024-12-27 23:24:29

关于如何处理您拥有的字符串有很多好的答案。但让我们猜测一下您应该问哪个问题。

如何按段落读取文件？ - 这恰好是常见问题。

如果您从文件中读取这些数据，那么您最好在读入时正确解析它。

#!/usr/bin/perl

use strict;
use warnings;
use 5.010;

local $/ = '';

while (<DATA>) {
  say "Record number $. is:\n$_";
}

__DATA__
iSCSI cred number=0
name=match1
string=2
name=number1

iSCSI cred number=1
name=match2
string=3
name=number2

iSCSI cred number=2
name=match3
string=4
name=number3

当然，这只是对您想要执行的操作的猜测。如果我离题太远了，请忽略我。

Plenty of good answers about how to deal with the string that you have. But let's take a punt at guessing which question you should be asking.

How can I read in a file by paragraphs? - which just happens to be a Frequently Asked Question.

If you're reading this data in from a file, then you'd be better off parsing it correctly as you read it in.

#!/usr/bin/perl

use strict;
use warnings;
use 5.010;

local $/ = '';

while (<DATA>) {
  say "Record number $. is:\n$_";
}

__DATA__
iSCSI cred number=0
name=match1
string=2
name=number1

iSCSI cred number=1
name=match2
string=3
name=number2

iSCSI cred number=2
name=match3
string=4
name=number3

This is, of course, just a guess at what you're trying to do. If I'm way off the mark then please ignore me.

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