使用Oracle Regexp从字段中提取电子邮件

Question

我希望在一个字段中收到电子邮件形成的文本.我在下面尝试过sql但没有运气.见SqlFiddle.从regexp中删除^和$也不起作用.

WITH TEST_DATA AS (
  SELECT 'foo@gmail.com' AS EMAIL FROM DUAL UNION ALL 
  SELECT 'mail foo@gmail.com' FROM DUAL UNION ALL           
  SELECT 'mail foo@gmail.com sent' FROM DUAL UNION ALL                
  SELECT 'foo@gmail.com sent count 23' FROM DUAL UNION ALL          
  SELECT 'mail already sent to foo@gmail.com and foo@hotmail.com' FROM DUAL UNION ALL                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   
  SELECT 'foo@gmail.com sent count 23' FROM DUAL             
)SELECT REGEXP_SUBSTR(EMAIL,'^[A-Za-z0-9._%+-]+@[A-Za-z0-9.-]+\.[A-Za-z]{2,4}$') MAIL
 FROM TEST_DATA;

此数据集的预期输出

foo@gmail.com 
foo@gmail.com 
foo@gmail.com 
foo@gmail.com 
foo@gmail.com, foo@hotmail.com 
foo@gmail.com

任何帮助赞赏.

Answer 1

如果要在单个列中提取多个邮件ID,可以使用REGEXP_REPLACE函数.

假设数据中的所有ID都是有效的,

REGEXP_REPLACE (EMAIL, '(\w+@\w+\.\w+ ?)|(.)', '\1')

这将删除除了至少由空格分隔的邮件ID之外的所有其他文本.

然后,您可以删除任何尾随空格并添加逗号以分隔多个ID.

REPLACE (TRIM (REGEXP_REPLACE (EMAIL, '(\w+@\w+\.\w+ ?)|(.)', '\1')),
            ' ',
            ', ')

例:

WITH TEST_DATA
     AS (SELECT 'foo@gmail.com' AS EMAIL FROM DUAL
         UNION ALL
         SELECT 'mail foo@gmail.com' FROM DUAL
         UNION ALL
         SELECT 'mail foo@gmail.com sent to 123@zxc.com and qwe@rt.com' FROM DUAL
         UNION ALL
         SELECT 'foo@gmail.com sent count 23 and asd@qwert.edu' FROM DUAL
         UNION ALL
         SELECT 'mail already sent to foo@gmail.com and foo@hotmail.com' FROM DUAL
         UNION ALL
         SELECT 'foo@gmail.com sent count 23' FROM DUAL)
SELECT REPLACE (TRIM (REGEXP_REPLACE (EMAIL, '(\w+@\w+\.\w+ ?)|(.)', '\1')),
                ' ',
                ', ')
          MAIL
  FROM TEST_DATA;

MAIL
-----------------------------
foo@gmail.com
foo@gmail.com
foo@gmail.com, 123@zxc.com, qwe@rt.com
foo@gmail.com, asd@qwert.edu
foo@gmail.com, foo@hotmail.com
foo@gmail.com