simple_symbols(str)

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Using the Ruby language, have the method simple_symbols(str) take the str parameter being passed and determine if it is an acceptable sequence by either returning the string true or false. The str parameter will be composed of + and = symbols with several letters between them (ie. ++d+===+c++==a) and for the string to be true each letter must be surrounded by a + symbol. So the string to the left would be false. The string will not be empty and will have at least one letter.

def simple_symbols?(str)
  arr_str = str.split(//)
  arr_str.each_with_index do |char,i|
    if char.match(/[a-z]/i) and arr_str[i-1] != "+" and arr_str[i+1] != "+"
      return false
    else
      return true
    end
  end
end
simple_symbols?("+d+=3=+s+") == true
simple_symbols?("f++d+") == false

Updated