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






  1. Ruby
  2. String
  3. 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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