44jrRd - Online Prolog Interpreter & Debugging Tool

%{
#include <stdio.h>
%}

%%

// Match valid C identifiers: starts with letter or underscore, followed by letters/digits/underscores
[a-zA-Z_][a-zA-Z0-9_]*    { printf("Valid Identifier: %s\n", yytext); }

// Match anything else
.|\n                      { printf("Invalid Identifier: %s\n", yytext); }

%%

int main() {
    yylex();  // Start lexical analysis
    return 0;
}