如何從字符串正則表達式中獲取所有數字ruby

Question

如何使用regexp在ruby中從句子字符串（如「Lorem 123 ipsum 456 879」=>「123456879」）獲取所有數字？

Answer 1

只需更換一切。

result = subject.gsub(/[^\d]/, '') 

Answer 2

"Lorem 123 ipsum 456 879".scan(/\d+/).join # => "123456879" 

Answer 3

參考this

result = subject.gsub(/\D/, '') 

Answer 4

已經給出了一些正確的答案，這可能包括你要使用的東西。一個稍微低層次方式：

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

Answer 5

沒有正則表達式：

"Lorem 123 ipsum 456 879".delete('^0-9') #=>"123456879" 

Answer 6

我總是用括號東西認爲是更容易閱讀

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

Answer 7

版本從@steenslag是最快，thx！

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)