Is there a way to make flex treat NULL like a regular character? - Lexical Analysis With Flex, for Flex 2.5.37

Next: Whenever flex can not match the input it says "flex scanner jammed"., Previous: I am trying to port code from AT&T lex that uses yysptr and yysbuf., Up: FAQ

Is there a way to make flex treat NULL like a regular character?

Yes, ‘\0’ and ‘\x00’ should both do the trick. Perhaps you have an ancient version of flex. The latest release is version 2.5.37.