// Utilisation de start condition
%%
%include Jflex.include

%xstate COMMENT

START = "/*"
END   = "*/"

%%
{START}        { yybegin(COMMENT);  System.out.print("/*.."); }

// syntaxe v1 
<COMMENT>{END} { yybegin(YYINITIAL); System.out.print("..*" + "/"); }
<COMMENT>[^]   { }

// syntaxe v2
// <COMMENT>{
//  {END}  { yybegin(YYINITIAL);  System.out.print("..*/"); }
//  [^]    { }
// }

[^]           { ECHO(); }