On this page:
default-lexer

4 Default Lexer🔗

 (require syntax-color/default-lexer)
  package: syntax-color-lib

procedure

(default-lexer in)  
(or/c string? eof-object?)
symbol?
(or/c symbol? #f)
(or/c number? #f)
(or/c number? #f)
  in : input-port?

A lexer that only identifies (, ), [, ], {, and } built specifically for color:text<%>.

default-lexer returns 5 values: