Digit = [1-9]
Digit0 = 0|{Digit}
Num = {Digit} {Digit0}*
Frac = {Digit0}* {Digit}
Pos = {Num} | '.' {Frac} | 0 '.' {Frac} | {Num} '.' {Frac}
PosOrNeg = -{Pos} | {Pos}

Numbers = 0 | {PosOrNeg}

/* literals */
{Numbers}            { return new Token(yytext(), sym.NUM, getLineNumber()); }