---input---
"A#{ (3..5).group_by { |x| x/2}.map do |k,v| "#{k}" end.join }" + "Z"

---tokens---
'"'           Literal.String.Double
'A'           Literal.String.Double
'#{'          Literal.String.Interpol
' '           Text.Whitespace
'('           Punctuation
'3'           Literal.Number.Integer
'..'          Operator
'5'           Literal.Number.Integer
')'           Punctuation
'.'           Operator
'group_by'    Name
' '           Text.Whitespace
'{'           Literal.String.Interpol
' '           Text.Whitespace
'|'           Operator
'x'           Name
'|'           Operator
' '           Text.Whitespace
'x'           Name
'/'           Operator
'2'           Literal.Number.Integer
'}'           Literal.String.Interpol
'.'           Operator
'map'         Name
' '           Text.Whitespace
'do'          Keyword
' '           Text.Whitespace
'|'           Operator
'k'           Name
','           Punctuation
'v'           Name
'|'           Operator
' '           Text.Whitespace
'"'           Literal.String.Double
'#{'          Literal.String.Interpol
'k'           Name
'}'           Literal.String.Interpol
'"'           Literal.String.Double
' '           Text.Whitespace
'end'         Keyword
'.'           Operator
'join'        Name
' '           Text.Whitespace
'}'           Literal.String.Interpol
'"'           Literal.String.Double
' '           Text.Whitespace
'+'           Operator
' '           Text.Whitespace
'"'           Literal.String.Double
'Z'           Literal.String.Double
'"'           Literal.String.Double
'\n'          Text.Whitespace