message: SV: add missig escape seq
diff: @@ -632,7 +632,7 @@ fragment ANY_ASCII_CHARACTERS:
  ~["\\\r\n]
  | '\\\n'
  | '\\\r\n'
  - | '\\' [nrt\\"vfa%]
  + | '\\' [abefnrtv$@luLEQU\\"%]
  | '\\' [0-9] [0-9]? [0-9]?
  | '\\' 'x' [0-9A-Fa-f] [0-9A-Fa-f]?
  ;
  