regex - 使用 REGEX_EXTRACT_ALL 但投影我得到 "()"

Question

我正在使用 Cloudera - quickstat 5.4。我有一个文件，每一行都有数据，例如:

323.81.303.680 - - [25/Oct/2011:01:41:00 -0500] "GET /download/download6.zip HTTP/1.1" 200 0 "-" "Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.0.19) Gecko/2010031422 Firefox/3.0.19"

在 apache pig 中，我使用的脚本如下:

A= LOAD 'weblog.txt' using TextLoader() as (line:chararray);
B= FOREACH A GENERATE 
FLATTEN(REGEX_EXTRACT_ALL(line,'^(\\S+) (\\S+) (\\S+) \\[([\\w:/]+\\s[+\\-]\\d{4})\\] “(.+?)” (\\S+) (\\S+) “([^”]*)” “([^”]*)”')) AS (remoteAddr: chararray, remoteLogname: chararray, user: chararray, time:chararray, request: chararray, status:int,bytes_string:chararray,referrer: chararray, browser: chararray);

DUMP B;

上面查询的输出给出类似

的输出

()
()

谁能告诉我我做错了什么？正则表达式可以吗？

Answer 1

在末尾添加, line，在chararray之后) 之前;:

A= LOAD 'weblog.txt' using TextLoader() as (line:chararray);
B= FOREACH A GENERATE FLATTEN(
    REGEX_EXTRACT_ALL(line,'^(\\S+) (\\S+) (\\S+) \\[([\\w:/]+\\s[+\\-]\\d{4})\\] "(.+?)" (\\S+) (\\S+) "([^"]*)" "([^"]*)"')) 
     AS (remoteAddr: chararray, remoteLogname: chararray, user: chararray, time:chararray, request: chararray, status:int,bytes_string:chararray,referrer: chararray, browser: chararray)
       , line;

DUMP B;

至于正则表达式，它与示例字符串匹配得很好，请参阅 regex demo .