blocks|key|532775|text|tr!的文档说|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|532776|532777|使用与String#tr相同的规则就地转换字符串。返回str，如果未做任何更改，则返回nil。|blockquote|532778|532779|532780|我认为如果您使用不带感叹号的tr，您会得到正确的结果。|532781|entityMap|0|LINK|mutability|MUTABLE|url|https://ruby-doc.org/core-2.4.1/String.html#method-i-tr-21|1|https://ruby-doc.org/core-2.4.1/String.html#method-i-tr^0|0|3|0|0|0|0|0|0|E|2|1|0^^$0|@$1|2|3|4|5|6|7|V|8|@]|9|@$A|W|B|X|1|Y]]|C|$]]|$1|D|3|-4|5|6|7|Z|8|@]|9|@]|C|$]]|$1|E|3|F|5|G|7|10|8|@]|9|@]|C|$]]|$1|H|3|-4|5|6|7|11|8|@]|9|@]|C|$]]|$1|I|3|-4|5|6|7|12|8|@]|9|@]|C|$]]|$1|J|3|K|5|6|7|13|8|@]|9|@$A|14|B|15|1|16]]|C|$]]|$1|L|3|-4|5|6|7|17|8|@]|9|@]|C|$]]]|M|$N|$5|O|P|Q|C|$R|S]]|T|$5|O|P|Q|C|$R|U]]]]

The docs for <a href="https://ruby-doc.org/core-2.4.1/String.html#method-i-tr-21" rel="noreferrer">tr!</a> say

<blockquote>
 Translates str in place, using the same rules as String#tr. Returns str, or nil if no changes were made.
</blockquote>

I think you'll get the correct results if you use <a href="https://ruby-doc.org/core-2.4.1/String.html#method-i-tr" rel="noreferrer">tr</a> without the exclamation.

blocks|key|2605150|text|带空格的|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2605151|blockquote|2605152|2605153|2605154|str+=+"New+School"
str.parameterize.underscore

=>+"new_school"|code-block|syntax|javascript|2605155|无空格的|2605156|2605157|2605158|2605159|str+=+"school"
str.parameterize.underscore

=>+"school"|2605160|编辑:-我们也可以将'_‘作为参数传递给parameterize。|2605161|2605162|2605163|2605164|2605165|str+=+"New+School"
str.parameterize('_')

=>+"new_school"|2605166|2605167|2605168|2605169|2605170|str+=+"school"
str.parameterize('_')

=>+"school"|2605171|编辑|offset|length|style|BOLD|2605172|对于Rails5和更高版本，请使用str.parameterize(separator:+'_')|CODE|2605173|entityMap^0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|2|0|H|W|0^^$0|@$1|2|3|4|5|6|7|1G|8|@]|9|@]|A|$]]|$1|B|3|-4|5|C|7|1H|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|1I|8|@]|9|@]|A|$]]|$1|E|3|-4|5|6|7|1J|8|@]|9|@]|A|$]]|$1|F|3|G|5|H|7|1K|8|@]|9|@]|A|$I|J]]|$1|K|3|L|5|6|7|1L|8|@]|9|@]|A|$]]|$1|M|3|-4|5|C|7|1M|8|@]|9|@]|A|$]]|$1|N|3|-4|5|6|7|1N|8|@]|9|@]|A|$]]|$1|O|3|-4|5|6|7|1O|8|@]|9|@]|A|$]]|$1|P|3|Q|5|H|7|1P|8|@]|9|@]|A|$I|J]]|$1|R|3|S|5|6|7|1Q|8|@]|9|@]|A|$]]|$1|T|3|4|5|6|7|1R|8|@]|9|@]|A|$]]|$1|U|3|-4|5|C|7|1S|8|@]|9|@]|A|$]]|$1|V|3|-4|5|6|7|1T|8|@]|9|@]|A|$]]|$1|W|3|-4|5|6|7|1U|8|@]|9|@]|A|$]]|$1|X|3|Y|5|H|7|1V|8|@]|9|@]|A|$I|J]]|$1|Z|3|L|5|6|7|1W|8|@]|9|@]|A|$]]|$1|10|3|-4|5|C|7|1X|8|@]|9|@]|A|$]]|$1|11|3|-4|5|6|7|1Y|8|@]|9|@]|A|$]]|$1|12|3|-4|5|6|7|1Z|8|@]|9|@]|A|$]]|$1|13|3|14|5|H|7|20|8|@]|9|@]|A|$I|J]]|$1|15|3|16|5|6|7|21|8|@$17|22|18|23|19|1A]]|9|@]|A|$]]|$1|1B|3|1C|5|6|7|24|8|@$17|25|18|26|19|1D]]|9|@]|A|$]]|$1|1E|3|-4|5|6|7|27|8|@]|9|@]|A|$]]]|1F|$]]

<blockquote>
 with space
</blockquote>

<pre><code>str = "New School"
str.parameterize.underscore

=&gt; "new_school"
</code></pre>

<blockquote>
 without space
</blockquote>

<pre><code>str = "school"
str.parameterize.underscore

=&gt; "school"
</code></pre>

Edit :- 
also we can pass '_' as parameter to parameterize.

<blockquote>
 with space
</blockquote>

<pre><code>str = "New School"
str.parameterize('_')

=&gt; "new_school"
</code></pre>

<blockquote>
 without space
</blockquote>

<pre><code>str = "school"
str.parameterize('_')

=&gt; "school"
</code></pre>

EDIT:

For Rails 5 and above, use <code>str.parameterize(separator: '_')</code>

blocks|key|2605115|text|如果您对获取snake+case中的字符串感兴趣，那么所提出的解决方案并不能很好地工作，因为您可能会得到连接的下划线和起始/尾随的下划线。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|2605116|例如|2605117|1.9.3-p0+:010+>+str=+"++John+++Smith+Beer+"
++=>+"++John+++Smith+Beer+"+
1.9.3-p0+:011+>+str.downcase.tr("+",+"_")
++=>+"__john___smith_beer_"|code-block|syntax|javascript|2605118|下面的解决方案会工作得更好：|2605119|1.9.3-p0+:010+>+str=+"++John+++Smith+Beer+"
++=>+"++John+++Smith+Beer+"+
1.9.3-p0+:012+>+str.squish.downcase.tr("+","_")
++=>+"john_smith_beer"+|2605120|squish是Rails提供的字符串方法|2605121|entityMap|0|LINK|mutability|MUTABLE|url|http://en.wikipedia.org/wiki/Snake_case^0|6|A|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Y|8|@]|9|@$A|Z|B|10|1|11]]|C|$]]|$1|D|3|E|5|6|7|12|8|@]|9|@]|C|$]]|$1|F|3|G|5|H|7|13|8|@]|9|@]|C|$I|J]]|$1|K|3|L|5|6|7|14|8|@]|9|@]|C|$]]|$1|M|3|N|5|H|7|15|8|@]|9|@]|C|$I|J]]|$1|O|3|P|5|6|7|16|8|@]|9|@]|C|$]]|$1|Q|3|-4|5|6|7|17|8|@]|9|@]|C|$]]]|R|$S|$5|T|U|V|C|$W|X]]]]

If you're interested in getting a string in <a href="http://en.wikipedia.org/wiki/Snake_case" rel="noreferrer">snake case</a>, then the proposed solution doesn't quite work, because you may get concatenated underscores and starting/trailing underscores.

For example

<pre><code>1.9.3-p0 :010 &gt; str= " John Smith Beer "
 =&gt; " John Smith Beer " 
1.9.3-p0 :011 &gt; str.downcase.tr(" ", "_")
 =&gt; "__john___smith_beer_"
</code></pre>

This solution below would work better:

<pre><code>1.9.3-p0 :010 &gt; str= " John Smith Beer "
 =&gt; " John Smith Beer " 
1.9.3-p0 :012 &gt; str.squish.downcase.tr(" ","_")
 =&gt; "john_smith_beer" 
</code></pre>

squish is a String method provided by Rails

blocks|key|2605215|text|如果您使用的是Rails5或更高版本，则可以使用|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2605216|str.parameterize(separator:+'_')|code-block|syntax|javascript|2605217|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

If you are using rails 5 and above you can achieve the same thing with 

<pre><code>str.parameterize(separator: '_')
</code></pre>

blocks|key|4220198|text|老问题，但是..。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4220199|对于all空格，您可能需要更多这样的内容：|offset|length|style|BOLD|4220200|"hey\t+there+++world".gsub(/\s%2B/,+'_')+#+hey_there_world|code-block|syntax|javascript|4220201|这将获得制表符、换行符以及空格，并替换为单个_。|CODE|4220202|可以修改正则表达式以满足您的需要。例如：|4220203|"hey\t+there+++world".gsub(/\s/,+'_')+#+hey__there___world|4220204|entityMap^0|0|2|3|0|0|M|1|0|0|0^^$0|@$1|2|3|4|5|6|7|V|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|W|8|@$D|X|E|Y|F|G]]|9|@]|A|$]]|$1|H|3|I|5|J|7|Z|8|@]|9|@]|A|$K|L]]|$1|M|3|N|5|6|7|10|8|@$D|11|E|12|F|O]]|9|@]|A|$]]|$1|P|3|Q|5|6|7|13|8|@]|9|@]|A|$]]|$1|R|3|S|5|J|7|14|8|@]|9|@]|A|$K|L]]|$1|T|3|-4|5|6|7|15|8|@]|9|@]|A|$]]]|U|$]]

Old question, but...

For all whitespace you probably want something more like this:

<pre><code>"hey\t there world".gsub(/\s+/, '_') # hey_there_world
</code></pre>

This gets tabs and new lines as well as spaces and replaces with a single <code>_</code>.

The regex can be modified to suit your needs. E.g:

<pre><code>"hey\t there world".gsub(/\s/, '_') # hey__there___world
</code></pre>

blocks|key|2605060|text|str.downcase.tr("+",+"_")|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|2605061|注:+No+"!“|unstyled|2605062|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|J|8|@]|9|@]|A|$]]|$1|G|3|-4|5|F|7|K|8|@]|9|@]|A|$]]]|H|$]]

<pre><code>str.downcase.tr(" ", "_")
</code></pre>

Note: No "!"

blocks|key|535617|text|str+=+"Foo+Bar"
str.tr('+','').underscore

=>+"foo_bar"|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|535618|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>str = "Foo Bar"
str.tr(' ','').underscore

=&gt; "foo_bar"
</code></pre>

blocks|key|4504252|text|你也可以做str.gsub(“"，"_")|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4504253|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

You can also do
str.gsub(" ", "_")

This works for any strings that have whitespaces in them

<pre><code>str.downcase.tr!(" ", "_")
</code></pre>

but strings that dont have whitespaces just get deleted

So "New School" would change into "new_school" but "color" would be "", nothing!

how to safely replace all whitespaces with underscores with ruby?

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。

文章

问答

视频

学习中心

腾讯云实验室

直播

竞赛

腾讯云代码分析专区

腾讯iOA零信任安全管理系统专区

腾讯云架构师技术同盟交流圈

腾讯云数据库专区

腾讯云顾问专区

腾讯云原生专区

腾讯混元专区

腾讯云TCE专区

腾讯云Lighthouse专区

腾讯云HAI专区

腾讯云Edgeone专区

腾讯云存储专区

腾讯云智能专区

腾讯轻联专区 

腾讯云开发专区

TAPD专区

腾讯轻量云游戏服专区

腾讯云最具价值专家

腾讯云架构师技术同盟

腾讯云创作之星

腾讯云开发者先锋

腾讯云代码助手

云原生构建

TAPD 敏捷项目管理

Cloud Studio

SDK中心

API中心

命令行工具

涵盖代码开发、场景应用、自动测试全流程，助你从零构建专属AI助手

一站式MCP教程库，解锁AI应用新玩法

这适用于其中包含空格的任何字符串str.downcase.tr!(" ", "_")但是没有空格的字符串会被删除所以“新学校”会变成"new_school“，但”颜色“会变成""，什么都不是！

问如何安全地用ruby替换所有带下划线的空格？
EN

回答 8

Stack Overflow用户

Stack Overflow用户

Stack Overflow用户

社区

活动

圈层

关于

腾讯云开发者

热门产品

热门推荐

更多推荐

问如何安全地用ruby替换所有带下划线的空格？EN

回答 8

Stack Overflow用户

Stack Overflow用户

Stack Overflow用户

社区

活动

圈层

关于

腾讯云开发者

热门产品

热门推荐

更多推荐

问如何安全地用ruby替换所有带下划线的空格？
EN