我如何筛选或分组那些少于5年和那些超过5年。我对Pig拉丁语很陌生。id（例如bus2003）应保持原样。
输入数据

ID,Experience
BUS2003,More than 17 years teaching experience
BUS1303,2 years teaching experience
BUS4543,13 plus years of teaching experience; 4 plus years of corporate experience
BUS2103,4 year + 6 years in business
BUS2913,8 yrs teaching experience

我知道如何将数据加载到pigstorage或csvloader，但是由于单词和数字在一起，我很难解决这个问题。
期望结果：

**Less than five years**

BUS1303,2 years teaching experience
BUS2103,4 year + 6 years in business

**Equal or greater than five years**

BUS2003,More than 17 years teaching experience
BUS4543,13 plus years of teaching experience; 4 plus years of corporate experience
BUS2913,8 yrs teaching experience

提前谢谢。