"Regular Expressions"

gistfile1.rb

# Determine whether a string contains a Social Security number.
def has_ssn?(string)
  /\d{3}-\d{2}-\d{4}/.match(string)
end

# Return the Social Security number from a string.
def grab_ssn(string)
  def grab_ssn(string)
  if /\d{3}-\d{2}-\d{4}/.match(string)
    string.match(/\d{3}-\d{2}-\d{4}/).to_s
  end
end

# Return all of the Social Security numbers from a string.
def grab_all_ssns(string)
  unless /\d{3}-\d{2}-\d{4}/.match(string)
   return Array.new
  else
    string.scan(/\d{3}-\d{2}-\d{4}/)
  end
end

# Obfuscate all of the Social Security numbers in a string. Example: XXX-XX-4430.
def hide_all_ssns(string)
  if /\d{3}-\d{2}-\d{4}/.match(string)
    string.gsub(/\d{3}-\d{2}-/,"XXX-XX-") #scan(/X{3}-X{2}-\d{4}/)
    #string.scan(/\d{3}-\d{2}-\d{4}/)
  else
    return string
  end
end

# Ensure all of the Social Security numbers use dashes for delimiters.
# Example: 480.01.4430 and 480014430 would both be 480-01-4430.
def format_ssns(string)
  unless /\d{3}-\d{2}-\d{4}/.match(string)
    return string
  else
    string.gsub(/\.+/, "-").gsub(/(\d{3})(\d{2})(\d{3})/, '\1-\2-\3')
  end
end