blocks|key|745771|text|您可以使用slice方法：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|745772|a+=+"foobar"
a.slice!+"foo"
=>+"foo"
a
=>+"bar"|code-block|syntax|javascript|745773|有一个非'!‘版本也一样。有关其他版本的更多信息也可以在文档中看到：http://www.ruby-doc.org/core/classes/String.html#method-i-slice-21|offset|length|745774|entityMap|0|LINK|mutability|MUTABLE|url|http://www.ruby-doc.org/core/classes/String.html#method-i-slice-21^0|0|0|Y|1U|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|T|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|U|8|@]|9|@$I|V|J|W|1|X]]|A|$]]|$1|K|3|-4|5|6|7|Y|8|@]|9|@]|A|$]]]|L|$M|$5|N|O|P|A|$Q|R]]]]

You can use the slice method:

<pre><code>a = "foobar"
a.slice! "foo"
=&gt; "foo"
a
=&gt; "bar"
</code></pre>

there is a non '!' version as well. More info can be seen in the documentation about other versions as well:
<a href="http://www.ruby-doc.org/core/classes/String.html#method-i-slice-21" rel="noreferrer">http://www.ruby-doc.org/core/classes/String.html#method-i-slice-21</a>

blocks|key|745808|text|看看Ruby+Doc怎么样？|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|745809|entityMap|0|LINK|mutability|MUTABLE|url|http://www.ruby-doc.org/core/classes/String.html^0|2|8|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@$A|M|B|N|1|O]]|C|$]]|$1|D|3|-4|5|6|7|P|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]]]

How about <code>str.gsub("subString", "")</code> 
Check out the <a href="http://www.ruby-doc.org/core/classes/String.html" rel="noreferrer">Ruby Doc</a>

blocks|key|961860|text|如果它是字符串的末尾，您也可以使用chomp|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|961861|"hello".chomp("llo")+++++#=>+"he"|code-block|syntax|javascript|961862|entityMap|0|LINK|mutability|MUTABLE|url|http://ruby-doc.org/core-2.1.1/String.html#method-i-chomp^0|H|5|H|5|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@$9|T|A|U|B|C]]|D|@$9|V|A|W|1|X]]|E|$]]|$1|F|3|G|5|H|7|Y|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|Z|8|@]|D|@]|E|$]]]|L|$M|$5|N|O|P|E|$Q|R]]]]

If it is a the end of the string, you can also use <a href="http://ruby-doc.org/core-2.1.1/String.html#method-i-chomp" rel="noreferrer"><code>chomp</code></a>:

<pre><code>"hello".chomp("llo") #=&gt; "he"
</code></pre>

blocks|key|961769|text|如果目标字符串只出现一次，则可以使用：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|961770|str[target]+=+''|code-block|syntax|javascript|961771|或|961772|str.sub(target,+'')|961773|如果有多次使用目标的情况：|961774|str.gsub(target,+'')|961775|例如：|961776|asdf+=+'foo+bar'
asdf['bar']+=+''
asdf+#=>+"foo+"

asdf+=+'foo+bar'
asdf.sub('bar',+'')+#=>+"foo+"
asdf+=+asdf+%2B+asdf+#=>+"foo+barfoo+bar"
asdf.gsub('bar',+'')+#=>+"foo+foo+"|961777|如果需要进行就地替换，请使用gsub!和sub!的"!"版本。|offset|length|style|CODE|961778|entityMap^0|0|0|0|0|0|0|0|0|E|5|K|4|P|3|0^^$0|@$1|2|3|4|5|6|7|10|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|11|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|12|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|13|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|14|8|@]|9|@]|A|$]]|$1|M|3|N|5|D|7|15|8|@]|9|@]|A|$E|F]]|$1|O|3|P|5|6|7|16|8|@]|9|@]|A|$]]|$1|Q|3|R|5|D|7|17|8|@]|9|@]|A|$E|F]]|$1|S|3|T|5|6|7|18|8|@$U|19|V|1A|W|X]|$U|1B|V|1C|W|X]|$U|1D|V|1E|W|X]]|9|@]|A|$]]|$1|Y|3|-4|5|6|7|1F|8|@]|9|@]|A|$]]]|Z|$]]

If you only have one occurrence of the target string you can use:

<pre><code>str[target] = ''
</code></pre>

or

<pre><code>str.sub(target, '')
</code></pre>

If you have multiple occurrences of target use:

<pre><code>str.gsub(target, '')
</code></pre>

For instance:

<pre><code>asdf = 'foo bar'
asdf['bar'] = ''
asdf #=&gt; "foo "

asdf = 'foo bar'
asdf.sub('bar', '') #=&gt; "foo "
asdf = asdf + asdf #=&gt; "foo barfoo bar"
asdf.gsub('bar', '') #=&gt; "foo foo "
</code></pre>

If you need to do in-place substitutions use the <code>"!"</code> versions of <code>gsub!</code> and <code>sub!</code>.

blocks|key|961945|text|如果你使用的是rails或者不太活跃的支持，你会得到String#remove和String#remove！方法|type|unstyled|depth|inlineStyleRanges|entityRanges|data|961946|def+remove!(*patterns)
++patterns.each+do+%7Cpattern%7C
++++gsub!+pattern,+""
++end

++self
end|code-block|syntax|javascript|961947|来源：http://api.rubyonrails.org/classes/String.html#method-i-remove|offset|length|961948|entityMap|0|LINK|mutability|MUTABLE|url|http://api.rubyonrails.org/classes/String.html#method-i-remove^0|0|0|3|1Q|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|T|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|U|8|@]|9|@$I|V|J|W|1|X]]|A|$]]|$1|K|3|-4|5|6|7|Y|8|@]|9|@]|A|$]]]|L|$M|$5|N|O|P|A|$Q|R]]]]

If you are using rails or at less activesupport you got String#remove and String#remove! method 

<pre><code>def remove!(*patterns)
 patterns.each do |pattern|
 gsub! pattern, ""
 end

 self
end
</code></pre>

source: <a href="http://api.rubyonrails.org/classes/String.html#method-i-remove" rel="nofollow noreferrer">http://api.rubyonrails.org/classes/String.html#method-i-remove</a>

blocks|key|745974|text|这是我要做的|type|unstyled|depth|inlineStyleRanges|entityRanges|data|745975|2.2.1+:015+>+class+String;+def+remove!(start_index,+end_index)+(end_index+-+start_index+%2B+1).times{+self.slice!+start_index+};+self+end;+end;
2.2.1+:016+>+++"idliketodeleteHEREallthewaytoHEREplease".remove!+14,+32
+=>+"idliketodeleteplease"+
2.2.1+:017+>+":)".remove!+1,1
+=>+":"+
2.2.1+:018+>+"ohnoe!".remove!+2,4
+=>+"oh!"+|code-block|syntax|javascript|745976|在多行上格式化：|745977|class+String
++++def+remove!(start_index,+end_index)
++++++++(end_index+-+start_index+%2B+1).times{+self.slice!+start_index+}
++++++++self
++++end+
end|745978|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|$]]

here's what I'd do

<pre><code>2.2.1 :015 &gt; class String; def remove!(start_index, end_index) (end_index - start_index + 1).times{ self.slice! start_index }; self end; end;
2.2.1 :016 &gt; "idliketodeleteHEREallthewaytoHEREplease".remove! 14, 32
 =&gt; "idliketodeleteplease" 
2.2.1 :017 &gt; ":)".remove! 1,1
 =&gt; ":" 
2.2.1 :018 &gt; "ohnoe!".remove! 2,4
 =&gt; "oh!" 
</code></pre>

Formatted on multiple lines:

<pre><code>class String
 def remove!(start_index, end_index)
 (end_index - start_index + 1).times{ self.slice! start_index }
 self
 end 
end
</code></pre>

I am just wondering if there is any method to remove string from another string?
Something like this:

<pre><code>class String
 def remove(s)
 self[s.length, self.length - s.length]
 end
end
</code></pre>

Remove substring from the string

我只是想知道是否有什么方法可以从另一个字符串中删除字符串？如下所示：class String  def remove(s)    self[s.length, self.length - s.length]  endend

问从字符串中删除子字符串
EN

回答 6

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