在javacc的Lookahead无法正常工作

Question

我正在尝试使用JAVACC解析一个简单的输入，我需要前瞻但它没有按预期工作

   LOOKAHEAD(LikeExpression())
    e=LikeExpression()    |     e=InExpression()

LikeExpression():
{..
..}
{

<LIKE>

}

InExpression():
{..
..}
{

[<NOT>]
("(")

}

INPUT：“像DELHI一样的城市”

com.sample.ParseException: Encountered " "LIKE" "like "" at line 1, column 35.
Was expecting one of:
"NOT" ...
"(" ...