---input---
<User name={'john'} last={'doe'} />

---tokens---
'<'           Punctuation
'User'        Name.Tag
' '           Text.Whitespace
'name'        Name.Attribute
'='           Operator
'{'           Punctuation
"'john'"      Literal.String.Single
'}'           Punctuation
' '           Text.Whitespace
'last'        Name.Attribute
'='           Operator
'{'           Punctuation
"'doe'"       Literal.String.Single
'}'           Punctuation
' '           Text.Whitespace
'/'           Punctuation
'>'           Punctuation
'\n'          Text.Whitespace