Replacing Multiple Patterns in a Single Pass : String class Extension « String « Ruby

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Ruby » String » String class Extension

Replacing Multiple Patterns in a Single Pass





class String

  def mgsub(key_value_pairs=[].freeze)

    regexp_fragments = key_value_pairs.collect { |k,v| k }

    gsub(Regexp.union(*regexp_fragments)) do |match|

      key_value_pairs.detect{|k,v| k =~ match}[1]

    end

  end

end



"GO HOME!".mgsub([[/.*GO/i, 'Home'], [/home/i, 'is where the heart is']])

# => "Home is where the heart is!"



"Here is number #123".mgsub([[/[a-z]/i, '#'], [/#/, 'P']])

# => "#### ## ###### P123"

"between".mgsub([[/ee/, 'AA'], [/e/, 'E']])      # Good code

# => "bEtwAAn"

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6.	Regular expression based comparison
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9.	Removes first character from self and returns it, changing self
10.	Adds last character of provided string to front of self
11.	Pops last character off self and returns it, changing self
12.	Pushes first character of provided string onto end of self
13.	Rotate left
14.	Rotate right
15.	Shifts first word off of self and returns; changes self
16.	Adds provided string to front of self
17.	Pops and returns last word off self; changes self
18.	Pushes provided string onto end of self
19.	Get acronym

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