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TLex 不提供用户定义分隔符，因此我们可以采用可选方案：MarkedToken(), Mark(), Get(), 和Peek()方法，获得我们需要的结果。
// As an example taking "," as a separator.
_LIT8(KSomeConstString, "first, second, third, fourth,");
while((ch = lex.Get()) != 0 )
while ((ch = lex.Peek()) != ',')
/* Now we have the string as the token,
* do something.. */