Apache pig apachepig中的正则表达式提取

我有这样的数据

A8
SS4
M9

我需要使用

REGEX_EXTRACT

我的猪声明如下

A = load 'data';
B = foreach A generate REGEX_EXTRACT($0,'\\*[^0-9]',1);
dump B;

但是，我的输出为null。

你能试试这个吗

选项1:

A = load 'input' AS (line:chararray);
B = FOREACH A GENERATE REGEX_EXTRACT(line,'(.*[^0-9])',1);
DUMP B;

A = load 'input' AS (line:chararray);
B = FOREACH A GENERATE REGEX_EXTRACT(line,'(^[A-Za-z]+).*',1);
DUMP B;

选项2:

A = load 'input' AS (line:chararray);
B = FOREACH A GENERATE REGEX_EXTRACT(line,'(.*[^0-9])',1);
DUMP B;

A = load 'input' AS (line:chararray);
B = FOREACH A GENERATE REGEX_EXTRACT(line,'(^[A-Za-z]+).*',1);
DUMP B;