---input---
f"*{n=!r:30}*"

---tokens---
'f'           Literal.String.Affix
'"'           Literal.String.Double
'*'           Literal.String.Double
'{'           Literal.String.Interpol
'n'           Name
'=!r:'        Literal.String.Interpol
'30'          Literal.String.Double
'}'           Literal.String.Interpol
'*'           Literal.String.Double
'"'           Literal.String.Double
'\n'          Text.Whitespace
