blocks|key|522143|text|只需替换其他所有内容。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|522144|result+=+subject.gsub(/[%5E\d]/,+'')|code-block|syntax|javascript|522145|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|$]]

Just replace everything else.

<pre><code>result = subject.gsub(/[^\d]/, '')
</code></pre>

blocks|key|522218|text|不使用正则表达式：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|522219|"Lorem+123+ipsum+456+879".delete('%5E0-9')+#=>"123456879"|code-block|syntax|javascript|522220|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|$]]

Without regex:

<pre><code>"Lorem 123 ipsum 456 879".delete('^0-9') #=&gt;"123456879"
</code></pre>

blocks|key|522150|text|参考this|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|522151|result+=+subject.gsub(/\D/,+'')++|code-block|syntax|javascript|522152|entityMap|0|LINK|mutability|MUTABLE|url|http://www.tutorialspoint.com/ruby/ruby_regular_expressions.htm^0|2|4|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@$A|R|B|S|1|T]]|C|$]]|$1|D|3|E|5|F|7|U|8|@]|9|@]|C|$G|H]]|$1|I|3|-4|5|6|7|V|8|@]|9|@]|C|$]]]|J|$K|$5|L|M|N|C|$O|P]]]]

Ref <a href="http://www.tutorialspoint.com/ruby/ruby_regular_expressions.htm" rel="noreferrer">this</a>

<pre><code>result = subject.gsub(/\D/, '') 
</code></pre>

blocks|key|522147|text|"Lorem+123+ipsum+456+879".scan(/\d%2B/).join+#+=>+"123456879"|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|522148|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>"Lorem 123 ipsum 456 879".scan(/\d+/).join # =&gt; "123456879"
</code></pre>

blocks|key|522322|text|@steenslag的版本是最快的，thx！|type|unstyled|depth|inlineStyleRanges|entityRanges|data|522323|require+'benchmark'

class+ExtractInt
++def+self.v1(string)
++++string.gsub(/[%5E\d]/,+'')
++end

++def+self.v2(string)
++++string.gsub(/\D/,+'')+
++end


++def+self.v3(string)
++++string.delete('%5E0-9')
++end

++def+self.run(m,+arg)
++++10000.times+do+
++++++self.send(m,+arg)
++++end
++end
end


Benchmark.bmbm+do+%7Cx%7C
++x.report('v1')+{+ExtractInt.run(:v1,+'AAAA4000')+}
++x.report('v2')+{+ExtractInt.run(:v2,+'AAAA4000')+}
++x.report('v3')+{+ExtractInt.run(:v3,+'AAAA4000')+}
end


#+Rehearsal+--------------------------------------
#+v1+++0.040000+++0.000000+++0.040000+(++0.041564)
#+v2+++0.040000+++0.000000+++0.040000+(++0.042386)
#+v3+++0.010000+++0.000000+++0.010000+(++0.011604)
#+-----------------------------+total:+0.090000sec

#++++++++++user+++++system++++++total++++++++real
#+v1+++0.040000+++0.000000+++0.040000+(++0.042176)
#+v2+++0.040000+++0.000000+++0.040000+(++0.043753)
#+v3+++0.010000+++0.000000+++0.010000+(++0.012960)|code-block|syntax|javascript|522324|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|$]]

The version from @steenslag is the fastest, thx! 

<pre><code>require 'benchmark'

class ExtractInt
 def self.v1(string)
 string.gsub(/[^\d]/, '')
 end

 def self.v2(string)
 string.gsub(/\D/, '') 
 end


 def self.v3(string)
 string.delete('^0-9')
 end

 def self.run(m, arg)
 10000.times do 
 self.send(m, arg)
 end
 end
end


Benchmark.bmbm do |x|
 x.report('v1') { ExtractInt.run(:v1, 'AAAA4000') }
 x.report('v2') { ExtractInt.run(:v2, 'AAAA4000') }
 x.report('v3') { ExtractInt.run(:v3, 'AAAA4000') }
end


# Rehearsal --------------------------------------
# v1 0.040000 0.000000 0.040000 ( 0.041564)
# v2 0.040000 0.000000 0.040000 ( 0.042386)
# v3 0.010000 0.000000 0.010000 ( 0.011604)
# ----------------------------- total: 0.090000sec

# user system total real
# v1 0.040000 0.000000 0.040000 ( 0.042176)
# v2 0.040000 0.000000 0.040000 ( 0.043753)
# v3 0.010000 0.000000 0.010000 ( 0.012960)
</code></pre>

blocks|key|522211|text|一些已经给出的正确答案，其中可能包括您想要使用的内容。一种稍微低级的方式：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|522212|"Lorem+123+ipsum+456+879".chars.select+{%7Cc%7C+c+=~+/\d/}.join|code-block|syntax|javascript|522213|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|$]]

Some correct answers already given, which probably includes what you want to use. A slightly more low-level way:

<pre><code>"Lorem 123 ipsum 456 879".chars.select {|c| c =~ /\d/}.join
</code></pre>

blocks|key|738700|text|我一直认为使用括号会更容易阅读。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|738701|"nwa240".chars.select+{%7Cs%7C+s+=~+/[0-9]/}|code-block|syntax|javascript|738702|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|$]]

I always thought using the brackets thing was easier to read

<pre><code>"nwa240".chars.select {|s| s =~ /[0-9]/}
</code></pre>

blocks|key|522400|text|在性能方面，tr()相当于delete！|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|522401|++...
++def+self.v3(string)
++++string.delete('%5E0-9')
++end

++def+self.v4(string)
++++string.tr('%5E0-9',+'')
++end

++def+self.run(m,+arg)
++++10000.times+do
++++++self.send(m,+arg)
++++end
++end
++...|code-block|syntax|javascript|522402|控制台：|522403|v3+++0.010000+++0.000000+++0.010000+(++0.005608)
v4+++0.010000+++0.000000+++0.010000+(++0.006141)|522404|entityMap^0|6|4|D|6|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@$9|R|A|S|B|C]|$9|T|A|U|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|V|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|W|8|@]|D|@]|E|$]]|$1|M|3|N|5|H|7|X|8|@]|D|@]|E|$I|J]]|$1|O|3|-4|5|6|7|Y|8|@]|D|@]|E|$]]]|P|$]]

<code>tr()</code> is pretty comparable to <code>delete</code> performance wise!

<pre><code> ...
 def self.v3(string)
 string.delete('^0-9')
 end

 def self.v4(string)
 string.tr('^0-9', '')
 end

 def self.run(m, arg)
 10000.times do
 self.send(m, arg)
 end
 end
 ...
</code></pre>

Console:

<pre><code>v3 0.010000 0.000000 0.010000 ( 0.005608)
v4 0.010000 0.000000 0.010000 ( 0.006141)
</code></pre>

How to get all the digits from a sentence string like "Lorem 123 ipsum 456 879" => "123456879" using regexp in ruby?

How to get all digits from string regexp ruby

如何在ruby中使用regexp从像"Lorem 123 ipsum 456879“=> "123456879”这样的句子字符串中获取所有的数字？

问如何从字符串regexp ruby中获取所有数字
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问如何从字符串regexp ruby中获取所有数字
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