在pig中使用regex_提取方法时打印空白

我想分割字符串进行面积转换。我有这样的数据

(149Sq.Yards)
(151Sq.Yards)
(190Sq.Yards)
(190Sq.Yards)

149  sq.yards
151  sq.yards

我想像这样拆分上面的数据

(149Sq.Yards)
(151Sq.Yards)
(190Sq.Yards)
(190Sq.Yards)

149  sq.yards
151  sq.yards

我尝试了以下代码

a = LOAD '/user/ahmedabad/Makkan_PropertyDetails_Apartment_Ahmedabad.csv' using PigStorage('\t') as (SourceWebSite:chararray,PropertyID:chararray,ListedOn:chararray,ContactName:chararray,TotalViews:int,Price:chararray,PriceperArea:chararray,NoOfBedRooms:int,NoOfBathRooms:int,FloorNoOfProperty:chararray,TotalFloors:int,Possession:chararray,BuiltUpArea:chararray,Furnished:chararray,Ownership:chararray,NewResale:chararray,Facing:chararray,title:chararray,PropertyAddress:chararray,NearByFacilities:chararray,PropertyFeatures:chararray,Sellerinfo:chararray,Description:chararray);
b = FOREACH a GENERATE BuiltUpArea; 
c = FILTER b BY (BuiltUpArea matches '.*Sq.Yards.*');
d = FOREACH c GENERATE (bigdecimal) REGEX_EXTRACT(BuiltUpArea,'(.*)', 1) * 9;   

---

转储d时，它打印为空。

您提到的正则表达式将匹配所有字符，因此它将尝试像这样进行乘法

（149Sq.Yards*9）

。这就是输出中出现null的原因

下面的正则表达式将从输入中单独拆分数字，并按如下方式相乘

（149*9）