---input---
(sum(rate(metric_test_app{app='turtle',proc='web'}[2m])) by(node))

---tokens---
'('           Operator
'sum'         Keyword
'('           Operator
'rate'        Keyword.Reserved
'('           Operator
'metric_test_app' Name.Variable
'{'           Punctuation
'app'         Name.Label
'='           Operator
"'"           Punctuation
'turtle'      Literal.String
"'"           Punctuation
','           Punctuation
'proc'        Name.Label
'='           Operator
"'"           Punctuation
'web'         Literal.String
"'"           Punctuation
'}'           Punctuation
'['           Punctuation
'2m'          Literal.String
']'           Punctuation
')'           Operator
')'           Operator
' '           Text.Whitespace
'by'          Keyword
'('           Operator
'node'        Name.Variable
')'           Operator
')'           Operator
'\n'          Text.Whitespace