我有以下数据。
• PRT_Edit & Set Shopping Cart in Retail
• PRT_Confirm Shopping Cart for Goods
o PRT-Ret_Process Supplier Invoice
o PRT-Web_Overview of Orders
o PRT_Update Outfirst Agreement
PRT_Axn_-Purchase and Requisition
数据包含特殊符号,制表符空格和空格。我想只从这些数据中提取文本部分:
PRT_Edit & Set Shopping Cart in Retail
PRT_Confirm Shopping Cart for Goods
PRT-Ret_Process Supplier Invoice
PRT-Web_Overview of Orders
PRT_Update Outfirst Agreement
我尝试在Pig Script中使用REGEX_EXTRACT_ALL如下所示,但它不起作用。
PRT = LOAD '/DATA' USING TEXTLOADER() AS (LINE:CHARARRAY);
Cleansed = FOREACH PRT GENERATE REGEX_EXTRACT_ALL(LINE,'[A-Z]*') AS DATA;
当我尝试转储 已清理 时,它不会显示任何数据。请任何人帮忙。
答案 0 :(得分:1)
您可以使用
Cleansed = FOREACH PRT GENERATE FLATTEN(
REGEX_EXTRACT_ALL(LINE, '^[^a-zA-Z]*([a-zA-Z].*[a-zA-Z])[^a-zA-Z]*$'))
AS (FIELD1:chararray), LINE;
正则表达式匹配以下内容:
^
- 字符串开头[^a-zA-Z]*
- 字符类([a-zA-Z].*[a-zA-Z])
- 我们之后将FIELD1
引用的捕获组,匹配:
[a-zA-Z].*[a-zA-Z]
- 拉丁字母,然后是任意字符,尽可能多(使用贪婪的*
,而不是*?
懒惰的字母)[^a-zA-Z]*
- 拉丁字母以外的0个或更多字符$
- 字符串结尾