Remove substring from the string

Question

I am just wondering if there is any method to remove string from another string  Something like this   class String   def remove s      self s length  self length - s length    end end

User · Answer

If it is a the end of the string  you can also use chomp    hello  chomp  llo          gt   he

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Ruby 2 5   If your substring is at the beginning of in the end of a string  then Ruby 2 5 has introduced the methods for this    delete prefix for removing a substring from the beginning of the string delete suffix for removing a substring from the end of the string

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How about str gsub  subString        Check out the Ruby Doc

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here s what I d do  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      Formatted on multiple lines   class String     def remove  start index  end index           end index - start index   1  times  self slice  start index           self     end  end

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If I m interpreting right  this question seems to ask for something like a minus  -  operation between strings  i e  the opposite of the built-in plus     operation  concatenation    Unlike the previous answers  I m trying to define such an operation that must obey the property   IF c   a   b THEN c - a   b AND c - b   a  We need only three built-in Ruby methods to achieve this    abracadabra  partition  abra   values at 0 2  join     cadabra    I won t explain how it works because it can be easily understood running one method at a time   Here is a proof of concept code     minus string rb class String   def - str      partition str  values at 0 2  join   end end    Add the following code and issue  ruby minus string rb  in the console to test require  minitest autorun   class MinusString Test  lt  MiniTest  Test    A B C  abra   cadabra   abracadabra     def test C eq A plus B     assert C    A   B   end    def test C minus A eq B     assert C - A    B   end    def test C minus B eq A     assert C - B    A   end  end   One last word of advice if you re using a recent Ruby version     2 0   use Refinements instead of monkey-patching String like in the previous example   It is as easy as   module MinusString   refine String do     def - str        partition str  values at 0 2  join     end   end end   and add using MinusString before the blocks where you need it

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If you are using rails or at less activesupport you got String remove and String remove  method   def remove   patterns    patterns each do  pattern      gsub  pattern       end    self end   source  http   api rubyonrails org classes String html method-i-remove

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You can use the slice method   a    foobar  a slice   foo    gt   foo  a   gt   bar    there is a non     version as well  More info can be seen in the documentation about other versions as well  http   www ruby-doc org core classes String html method-i-slice-21

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def replaceslug   slug        name      replacements                                                            -                   -                    c             S     s             I     i             I     i                    u                    o             G     g                    c             s     s             i     i                    u                    o             g     g             replacements each do  pair      slug gsub  pair 0   pair 1     end   self slug   slug downcase end

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If you are using Rails there s also remove   E g   Testmessage  remove  message   yields  Test    Warning  this method removes all occurrences

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If you only have one occurrence of the target string you can use   str target         or  str sub target        If you have multiple occurrences of target use   str gsub target        For instance   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     If you need to do in-place substitutions use the     versions of gsub  and sub

[ruby] Remove substring from the string

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