---input---
This is a comment.

@ARTICLE{ruckenstein-diffusion,
    author = "Liu, Hongquin" # and # "Ruckenstein, Eli",
    year = 1997,
    month = JAN,
    pages = "888-895"
}

---tokens---
'This is a comment.' Comment
'\n\n'        Text.Whitespace

'@ARTICLE'    Name.Class
'{'           Punctuation
'ruckenstein-diffusion' Name.Label
','           Punctuation
'\n    '      Text.Whitespace
'author'      Name.Attribute
' '           Text.Whitespace
'='           Punctuation
' '           Text.Whitespace
'"'           Literal.String
'Liu, Hongquin' Literal.String
'"'           Literal.String
' '           Text.Whitespace
'#'           Punctuation
' '           Text.Whitespace
'and'         Name.Variable
' '           Text.Whitespace
'#'           Punctuation
' '           Text.Whitespace
'"'           Literal.String
'Ruckenstein, Eli' Literal.String
'"'           Literal.String
','           Punctuation
'\n    '      Text.Whitespace
'year'        Name.Attribute
' '           Text.Whitespace
'='           Punctuation
' '           Text.Whitespace
'1997'        Literal.Number
','           Punctuation
'\n    '      Text.Whitespace
'month'       Name.Attribute
' '           Text.Whitespace
'='           Punctuation
' '           Text.Whitespace
'JAN'         Name.Variable
','           Punctuation
'\n    '      Text.Whitespace
'pages'       Name.Attribute
' '           Text.Whitespace
'='           Punctuation
' '           Text.Whitespace
'"'           Literal.String
'888-895'     Literal.String
'"'           Literal.String
'\n'          Text.Whitespace

'}'           Punctuation
'\n'          Text.Whitespace