// An example of using the flex C++ scanner class. %option C++ noyywrap %{ int mylineno = 0; %} string \"[^\n"]+\" ws [ \t]+ alpha [A-Za-z] dig [0-9] name ({alpha}|{dig}|\$)({alpha}|{dig}|\_|\.|\-|\/|\$)* num1 [-+]?{dig}+\.?([eE][-+]?{dig}+)? num2 [-+]?{dig}*\.{dig}+([eE][-+]?{dig}+)? number {num1}|{num2} %% {ws} /* skip blanks and tabs */ "/*" { int c; while((c = yyinput()) != 0) { if(c == '\n') ++mylineno; else if(c == '*') { if((c = yyinput()) == '/') break; else unput(c); } } } {number} std::cout << "number " << YYText() << '\n'; \n mylineno++; {name} std::cout << "name " << YYText() << '\n'; {string} std::cout << "string " << YYText() << '\n'; %% int main( int /* argc */, char** /* argv */ ) { FlexLexer* lexer = new yyFlexLexer; while(lexer->yylex() != 0) ; return 0; }