blocks|key|1284627|text|您可以在此处使用拆分：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1284628|split+/,+/,$_;+#split+for+every+(<comma><space>)comma+followed+by+a+space|code-block|syntax|javascript|1284629|例如：|1284630|>+echo+"eggs,bread,bacon:breakfast,+12312-1565A,+http://wwwdinner.com"%7Cperl+-lne+'@a=split+/,+/;print+$a[0]'
eggs,bread,bacon:breakfast|1284631|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

you can use split here:

<pre><code>split /, /,$_; #split for every (&lt;comma&gt;&lt;space&gt;)comma followed by a space
</code></pre>

for eg:

<pre><code>&gt; echo "eggs,bread,bacon:breakfast, 12312-1565A, http://wwwdinner.com"|perl -lne '@a=split /, /;print $a[0]'
eggs,bread,bacon:breakfast
</code></pre>

blocks|key|5149196|text|您可以先使用split。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|5149197|my+@p=split/,/+;|code-block|syntax|javascript|5149198|然后将前几个部分连接在一起|5149199|$first=join(",",@p[0..scalar(@p)-3]);
$second=$p[-2];
$third=$p[-1];|5149200|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

You can first use split.

<pre><code>my @p=split/,/ ;
</code></pre>

Then join the first several parts together

<pre><code>$first=join(",",@p[0..scalar(@p)-3]);
$second=$p[-2];
$third=$p[-1];
</code></pre>

blocks|key|1365215|text|一种方法是使用正则表达式并将其锚定到字符串中一致的某个部分。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1365216|例如，要转换为以"%7C“分隔的管道：|1365217|$+perl+-pe+'s/(.*),+([0-9]*-[0-9]*),+(.*)/$1%7C$2%7C$3/'+<+f
analogy+of+dinner%7C12312-12351%7Chttp://wwwdinner.com
eggs,bread,bacon:breakfast%7C12312-12351%7Chttp://wwwdinner.com|code-block|syntax|javascript|1365218|其中0-9-0-9可以匹配中间有破折号的任何一系列数字。例如，23-123213、9-1234和123123213-4将全部匹配。把表达式放在()中“记住”它们，它们可以在以后通过数字引用：$1+=第一个记忆的字段，$2+=第二个，依此类推。|1365219|http://codeidol.com/perl/effective-perl/Regular-Expressions/Use-regular-expression-memory./|offset|length|1365220|之所以第一个模式"(.*)，“匹配到最后一个"，”而不是第一个，是因为perl正则表达式默认是“贪婪的”-它们试图尽可能地匹配。|1365221|http://www.troubleshooters.com/codecorn/littperl/perlreg.htm#Greedy|1365222|entityMap|0|LINK|mutability|MUTABLE|url|1^0|0|0|0|0|0|2J|0|0|0|0|1V|1|0^^$0|@$1|2|3|4|5|6|7|10|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|11|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|12|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|13|8|@]|9|@]|A|$]]|$1|K|3|L|5|6|7|14|8|@]|9|@$M|15|N|16|1|17]]|A|$]]|$1|O|3|P|5|6|7|18|8|@]|9|@]|A|$]]|$1|Q|3|R|5|6|7|19|8|@]|9|@$M|1A|N|1B|1|1C]]|A|$]]|$1|S|3|-4|5|6|7|1D|8|@]|9|@]|A|$]]]|T|$U|$5|V|W|X|A|$Y|L]]|Z|$5|V|W|X|A|$Y|R]]]]

One way is to use a regex and anchor it to some part of your strings that are consistent.

For example, to convert to pipe "|" separated:

<pre><code>$ perl -pe 's/(.*), ([0-9]*-[0-9]*), (.*)/$1|$2|$3/' &lt; f
analogy of dinner|12312-12351|http://wwwdinner.com
eggs,bread,bacon:breakfast|12312-12351|http://wwwdinner.com
</code></pre>

Where the [0-9]-[0-9] matches any series of numbers with a dash between them. 23-123213, 9-1234 and 123123213-4 would all match for example. Putting the expressions in () "memorizes" them and they can be referred to later by number: $1 = the first memorized field, $2 = the second, etc.

<a href="http://codeidol.com/perl/effective-perl/Regular-Expressions/Use-regular-expression-memory./" rel="nofollow">http://codeidol.com/perl/effective-perl/Regular-Expressions/Use-regular-expression-memory./</a>

The reason the first pattern "(.*)," matches to the last "," not the first is because perl regex's are by default "greedy" - they try to match as much as possible.

<a href="http://www.troubleshooters.com/codecorn/littperl/perlreg.htm#Greedy" rel="nofollow">http://www.troubleshooters.com/codecorn/littperl/perlreg.htm#Greedy</a>

blocks|key|1365264|text|在不了解数据的全部可能性的情况下，很难判断最佳选项是什么。但最好还是关注中间不需要的字段，我认为它应该是由连字符连接的两个数字或大写字母序列。是那么回事吗？|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1365265|然后，您可以使用简单的正则表达式来解析这些行，如下所示|1365266|use+strict;
use+warnings;

while+(<DATA>)+{
++if+(my+@parts+=+/%5E(.%2B),\s*([0-9A-Z]%2B-[0-9A-Z]%2B),\s*(.%2B)$/)+{
++++printf+"%25s+~+%25s\n",+@parts[0,2];
++}
}

__DATA__
analogy+of+dinner,+12312-12351,+http://wwwdinner.com
eggs,bread,bacon:breakfast,+12312-1565A,+http://wwwdinner.com|code-block|syntax|javascript|1365267|输出|offset|length|style|BOLD|1365268|analogy+of+dinner+~+http://wwwdinner.com
eggs,bread,bacon:breakfast+~+http://wwwdinner.com|1365269|entityMap^0|0|0|0|0|2|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|T|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|U|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|V|8|@$K|W|L|X|M|N]]|9|@]|A|$]]|$1|O|3|P|5|F|7|Y|8|@]|9|@]|A|$G|H]]|$1|Q|3|-4|5|6|7|Z|8|@]|9|@]|A|$]]]|R|$]]

It is difficult to tell what is the best option without knowing the full range of possibilities of your data. But it seems best to focus on the middle, unwanted field that I think should be two sequences of digits or capital letters joined by a hyphen. Is that right?

Then you can parse the lines using a simple regex, like this

<pre><code>use strict;
use warnings;

while (&lt;DATA&gt;) {
 if (my @parts = /^(.+),\s*([0-9A-Z]+-[0-9A-Z]+),\s*(.+)$/) {
 printf "%s ~ %s\n", @parts[0,2];
 }
}

__DATA__
analogy of dinner, 12312-12351, http://wwwdinner.com
eggs,bread,bacon:breakfast, 12312-1565A, http://wwwdinner.com
</code></pre>

output

<pre><code>analogy of dinner ~ http://wwwdinner.com
eggs,bread,bacon:breakfast ~ http://wwwdinner.com
</code></pre>

blocks|key|1278256|text|为了好玩，|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1278257|my+@fields+=+reverse+map+"".reverse,+split+/\s*,/,+reverse($_),+3;|code-block|syntax|javascript|1278258|我是认真的,|1278259|my+@fields+=+/%5E(.*),\s*(\S%2B),\s*(\S%2B)\z/;|1278260|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

For fun,

<pre><code>my @fields = reverse map "".reverse, split /\s*,/, reverse($_), 3;
</code></pre>

Seriously,

<pre><code>my @fields = /^(.*),\s*(\S+),\s*(\S+)\z/;
</code></pre>

blocks|key|1365084|text|您可以使用split+/([%5E:]*:)?([%5E,]*),([%5E,]*),(.*)/g,+$str。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1365085|这里有几个例子：|1365086|my+$str+=+"eggs,bread,bacon:breakfast,+12312-1565A,+http://wwwdinner.com";
my+@parts+=+split+/([%5E:]*:)?([%5E,]*),([%5E,]*),(.*)/g,+$str;

print+$parts[1];+#eggs,bread,bacon:
print+$parts[2];+#breakfast
print+$parts[3];+#+12312-1565A
print+$parts[4];+#+http://wwwdinner.com"|code-block|syntax|javascript|1365087|如果使用第一个字符串，则分别为：|1365088|my+$str1+=+"analogy+of+dinner,+12312-12351,+http://wwwdinner.com";
my+@parts+=+split+/([%5E:]*:)?([%5E,]*),([%5E,]*),(.*)/g,+$str1;

print+$parts[2];+#analogy+of+dinner
print+$parts[3];+#+12312-1565A
print+$parts[4];+#+http://wwwdinner.com"|1365089|entityMap^0|5|18|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@$9|T|A|U|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|V|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|W|8|@]|D|@]|E|$K|L]]|$1|M|3|N|5|6|7|X|8|@]|D|@]|E|$]]|$1|O|3|P|5|J|7|Y|8|@]|D|@]|E|$K|L]]|$1|Q|3|-4|5|6|7|Z|8|@]|D|@]|E|$]]]|R|$]]

You can use <code>split /([^:]*:)?([^,]*),([^,]*),(.*)/g, $str</code>.

Here are few examples:

<pre><code>my $str = "eggs,bread,bacon:breakfast, 12312-1565A, http://wwwdinner.com";
my @parts = split /([^:]*:)?([^,]*),([^,]*),(.*)/g, $str;

print $parts[1]; #eggs,bread,bacon:
print $parts[2]; #breakfast
print $parts[3]; # 12312-1565A
print $parts[4]; # http://wwwdinner.com"
</code></pre>

And respectively if you use the first string:

<pre><code>my $str1 = "analogy of dinner, 12312-12351, http://wwwdinner.com";
my @parts = split /([^:]*:)?([^,]*),([^,]*),(.*)/g, $str1;

print $parts[2]; #analogy of dinner
print $parts[3]; # 12312-1565A
print $parts[4]; # http://wwwdinner.com"
</code></pre>

I have a file with lines like:

<pre><code>analogy of dinner, 12312-12351, http://wwwdinner.com
</code></pre>

Sometimes the lines are like:

<pre><code>eggs,bread,bacon:breakfast, 12312-1565A, http://wwwdinner.com
</code></pre>

I want to split the string up into 3 parts using commas or something, but sometimes the front part has commas, so I do not know how.

I only need the front part and the back part. I do not need the middle part, which is the numbers part; but sometimes there are letters there too.

perl string manipulation

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我有一个文件，其中的代码行如下：analogy of dinner, 12312-12351, http://wwwdinner.com有时，这些行是这样的：eggs,bread,bacon:breakfast, 12312-1565A, http://wwwdinner.com我想用逗号把字符串分成3个部分，但有时前面有逗号，所以我不知道怎么做。我只需要前面和后面的部分。我不需要中间部分，也就是

问perl字符串操作
EN

回答 6

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