slt.l

%{
#include <stdio.h>

enum yytokentype {
	COMMA = 258,
	SEMICOLON = 259
};

char *yylval;
%}

%%

"#".+?"\n" { /* comment */ }

\s+ {}

"," { return COMMA; }
";" { return SEMICOLON; }

%%

int main(int argc, char **argv) {
	int tok;
	while (tok = yylex()) {
		printf("%d\n", tok);
	}
}