blocks|key|434634|text|您可以使用Match或=~，这将为您提供单个匹配，并且您可以以相同的方式访问匹配数据，或者只使用特殊的匹配变量$1、$2、$3|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|434635|类似于：|434636|if+ryan_string+=~+/(%5E.*)(:)(.*)/i
+++first+=+$1
+++third+=+$3
end|code-block|syntax|javascript|434637|entityMap|0|LINK|mutability|MUTABLE|url|http://ruby-doc.org/core-1.9.3/String.html#method-i-match^0|5|5|0|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@$A|T|B|U|1|V]]|C|$]]|$1|D|3|E|5|6|7|W|8|@]|9|@]|C|$]]|$1|F|3|G|5|H|7|X|8|@]|9|@]|C|$I|J]]|$1|K|3|-4|5|6|7|Y|8|@]|9|@]|C|$]]]|L|$M|$5|N|O|P|C|$Q|R]]]]

You could use <a href="http://ruby-doc.org/core-1.9.3/String.html#method-i-match" rel="noreferrer">Match</a> or =~ instead which would give you a single match and you could either access the match data the same way or just use the special match variables $1, $2, $3

Something like: 

<pre><code>if ryan_string =~ /(^.*)(:)(.*)/i
 first = $1
 third = $3
end
</code></pre>

blocks|key|649151|text|你不需要scan来做这件事，因为它没什么意义。您可以使用String#match，它将返回一个MatchData对象，然后您可以调用#captures返回一个捕获数组。如下所示：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|649152|#!/usr/bin/env+ruby

string+=+"RyanOnRails:+This+is+a+test"
one,+two,+three+=+string.match(/(%5E.*)(:)(.*)/i).captures

p+one+++#=>+"RyanOnRails"
p+two+++#=>+":"
p+three+#=>+"+This+is+a+test"|code-block|syntax|javascript|649153|请注意，如果没有找到匹配项，String#match将返回nil，因此下面这样的代码可能会更好地工作：|649154|if+match+=+string.match(/(%5E.*)(:)(.*)/i)
++one,+two,+three+=+match.captures
end|649155|尽管scan对此并没有多大意义。它仍然可以做这项工作，你只需要首先扁平化返回的数组。one,+two,+three+=+string.scan(/(%5E.*)(:)(.*)/i).flatten|649156|entityMap^0|4|4|S|C|1B|9|1U|9|0|0|E|C|0|0|2|4|16|1I|0^^$0|@$1|2|3|4|5|6|7|S|8|@$9|T|A|U|B|C]|$9|V|A|W|B|C]|$9|X|A|Y|B|C]|$9|Z|A|10|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|11|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|12|8|@$9|13|A|14|B|C]]|D|@]|E|$]]|$1|M|3|N|5|H|7|15|8|@]|D|@]|E|$I|J]]|$1|O|3|P|5|6|7|16|8|@$9|17|A|18|B|C]|$9|19|A|1A|B|C]]|D|@]|E|$]]|$1|Q|3|-4|5|6|7|1B|8|@]|D|@]|E|$]]]|R|$]]

You don't want <code>scan</code> for this, as it makes little sense. You can use <code>String#match</code> which will return a <code>MatchData</code> object, you can then call <code>#captures</code> to return an Array of captures. Something like this:

<pre><code>#!/usr/bin/env ruby

string = "RyanOnRails: This is a test"
one, two, three = string.match(/(^.*)(:)(.*)/i).captures

p one #=&gt; "RyanOnRails"
p two #=&gt; ":"
p three #=&gt; " This is a test"
</code></pre>

Be aware that if no match is found, <code>String#match</code> will return nil, so something like this might work better:

<pre><code>if match = string.match(/(^.*)(:)(.*)/i)
 one, two, three = match.captures
end
</code></pre>

Although <code>scan</code> does make little sense for this. It does still do the job, you just need to flatten the returned Array first. <code>one, two, three = string.scan(/(^.*)(:)(.*)/i).flatten</code>

blocks|key|434788|text|scan()将在字符串中查找正则表达式的所有非重叠匹配，因此它返回的不是您期望的组的数组数组，而是数组数组的数组。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|434789|使用match()，然后使用MatchData#captures获取捕获数组可能会更好|434790|g1,+g2,+g3+=+ryan_string.match(/(%5E.*)(:)(.*)/i).captures|code-block|syntax|javascript|434791|但是，如果您愿意，也可以使用scan()执行此操作：|434792|g1,+g2,+g3+=+ryan_string.scan(/(%5E.*)(:)(.*)/i)[0]|434793|entityMap^0|0|6|0|2|7|E|I|0|0|E|6|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|@$9|W|A|X|B|C]|$9|Y|A|Z|B|C]]|D|@]|E|$]]|$1|H|3|I|5|J|7|10|8|@]|D|@]|E|$K|L]]|$1|M|3|N|5|6|7|11|8|@$9|12|A|13|B|C]]|D|@]|E|$]]|$1|O|3|P|5|J|7|14|8|@]|D|@]|E|$K|L]]|$1|Q|3|-4|5|6|7|15|8|@]|D|@]|E|$]]]|R|$]]

<code>scan()</code> will find all non-overlapping matches of the regex in your string, so instead of returning an array of your groups like you seem to be expecting, it is returning an array of arrays.

You are probably better off using <code>match()</code>, and then getting the array of captures using <code>MatchData#captures</code>:

<pre><code>g1, g2, g3 = ryan_string.match(/(^.*)(:)(.*)/i).captures
</code></pre>

However you could also do this with <code>scan()</code> if you wanted to:

<pre><code>g1, g2, g3 = ryan_string.scan(/(^.*)(:)(.*)/i)[0]
</code></pre>

blocks|key|649311|text|您可以命名捕获的匹配项|type|unstyled|depth|inlineStyleRanges|entityRanges|data|649312|string+=+"RyanOnRails:+This+is+a+test"
/(?<one>%5E.*)(?<two>:)(?<three>.*)/i+=~+string
puts+one,+two,+three|code-block|syntax|javascript|649313|如果颠倒字符串和正则表达式的顺序，它将不起作用。|649314|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

You can name your captured matches 

<pre><code>string = "RyanOnRails: This is a test"
/(?&lt;one&gt;^.*)(?&lt;two&gt;:)(?&lt;three&gt;.*)/i =~ string
puts one, two, three
</code></pre>

It doesn't work if you reverse the order of string and the regex.

I'm currently trying to rexp a string into multiple variables. Example string: 

<pre><code>ryan_string = "RyanOnRails: This is a test"
</code></pre>

I've matched it with this regexp, with 3 groups: 

<pre><code>ryan_group = ryan_string.scan(/(^.*)(:)(.*)/i)
</code></pre>

Now to access each group I have to do something like this: 

<pre><code>ryan_group[0][0] (first group) RyanOnRails
ryan_group[0][1] (second group) :
ryan_group[0][2] (third group) This is a test
</code></pre>

This seems pretty ridiculous and it feels like I'm doing something wrong. I would be expect to be able to do something like this:

<pre><code>g1, g2, g3 = ryan_string.scan(/(^.*)(:)(.*)/i)
</code></pre>

Is this possible? Or is there a better way than how I'm doing it?

Ruby Regexp group matching, assign variables on 1 line

我目前正在尝试将一个字符串重新编译成多个变量。示例字符串：ryan_string = "RyanOnRails: This is a test"我将其与下面的regexp进行了匹配，其中包含3个组：ryan_group = ryan_string.scan(/(^.*)(:)(.*)/i)现在，要访问每个组，我必须这样...

问Ruby Regexp组匹配，在一行上赋值变量
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