在 Oracle 中获取子字符串

Question

我有一个字符串 -

V_TAG_B = utm_source=google_search&utm_medium=cpc&utm_term={Keyword}&utm_campaign=home-|-SBI-|-search

我需要将这个字符串分成 4 个小部分作为 -

V_UTM_SOURCE = utm_source=google_search&
V_UTM_MEDIUM = utm_medium=cpc&
V_UTM_TERM = utm_term={Keyword}&
V_UTM_CAMPAIGN = utm_campaign=home-|-SBI-|-search

我需要这样做，因为字符串可以按任何顺序排列，例如 utm_campaign 先到，utm_source 最后到。 因此，在将其分成几部分后，我将再次连接它并与我们的数据库表匹配，其中一列与该字符串具有相同的值。 我使用 SUBSTR/INSTR 组合实现了这一点，如下所示 -

-- Assigning First Keyword
      IF UPPER(SUBSTR(V_TAG_B, 1, INSTR(V_TAG_B, '=', 1, 1)-1)) LIKE '%UTM_SOURCE%' THEN
         V_UTM_SOURCE := SUBSTR(V_TAG_B, 1, INSTR(V_TAG_B, '&', 1, 1));
      ELSIF UPPER(SUBSTR(V_TAG_B, 1, INSTR(V_TAG_B, '=', 1, 1)-1)) LIKE '%UTM_MEDIUM%' THEN
         V_UTM_MEDIUM := SUBSTR(V_TAG_B, 1, INSTR(V_TAG_B, '&', 1, 1));
      ELSIF UPPER(SUBSTR(V_TAG_B, 1, INSTR(V_TAG_B, '=', 1, 1)-1)) LIKE '%UTM_TERM%' THEN
         V_UTM_TERM := SUBSTR(V_TAG_B, 1, INSTR(V_TAG_B, '&', 1, 1));
      ELSE
         V_UTM_CAMPAIGN := SUBSTR(V_TAG_B, 1, INSTR(V_TAG_B, '&', 1, 1));
      END IF;

      -- Assigning Second Keyword
      IF UPPER(SUBSTR(V_TAG_B, INSTR(V_TAG_B, '&', 1, 1)+1)) LIKE '%UTM_SOURCE%' THEN
         V_UTM_SOURCE := SUBSTR(SUBSTR(V_TAG_B, INSTR(V_TAG_B, '&', 1, 1)+1), 1, INSTR(SUBSTR(V_TAG_B, INSTR(V_TAG_B, '&', 1, 1)+1), '&', 1, 1));
      ELSIF UPPER(SUBSTR(V_TAG_B, INSTR(V_TAG_B, '&', 1, 1)+1)) LIKE '%UTM_MEDIUM%' THEN
         V_UTM_MEDIUM := SUBSTR(SUBSTR(V_TAG_B, INSTR(V_TAG_B, '&', 1, 1)+1), 1, INSTR(SUBSTR(V_TAG_B, INSTR(V_TAG_B, '&', 1, 1)+1), '&', 1, 1));
      ELSIF UPPER(SUBSTR(V_TAG_B, INSTR(V_TAG_B, '&', 1, 1)+1)) LIKE '%UTM_TERM%' THEN
         V_UTM_TERM := SUBSTR(SUBSTR(V_TAG_B, INSTR(V_TAG_B, '&', 1, 1)+1), 1, INSTR(SUBSTR(V_TAG_B, INSTR(V_TAG_B, '&', 1, 1)+1), '&', 1, 1));
      ELSE
         V_UTM_CAMPAIGN := SUBSTR(SUBSTR(V_TAG_B, INSTR(V_TAG_B, '&', 1, 1)+1), 1, INSTR(SUBSTR(V_TAG_B, INSTR(V_TAG_B, '&', 1, 1)+1), '&', 1, 1));
      END IF;

我想这也可以使用 REGEXP SUBSTR 快速轻松地实现。 任何帮助/建议表示赞赏。

Answer 1

您可以使用REGEXP_SUBSTR如下：

SQL> SELECT
  2      REGEXP_SUBSTR(STR, 'utm_source=[^&]+') as V_UTM_SOURCE,
  3      REGEXP_SUBSTR(STR, 'utm_medium=[^&]+') as V_UTM_MEDIUM,
  4      REGEXP_SUBSTR(STR, 'utm_term=[^&]+') as V_UTM_TERM,
  5      REGEXP_SUBSTR(STR, 'utm_campaign=[^&]+') as V_UTM_CAMPAIGN
  6  FROM
  7      ( SELECT 'V_TAG_B = utm_source=google_search&utm_medium=cpc&utm_term {Keyword}&utm_campaign=home-|-SBI-|-search' AS STR
  8          FROM DUAL);

V_UTM_SOURCE              V_UTM_MEDIUM         V_UTM_TERM           V_UTM_CAMPAIGN
------------------------- -------------------- -------------------- ---------------------------------
utm_source=google_search  utm_medium=cpc       utm_term={Keyword}   utm_campaign=home-|-SBI-|-search

SQL>

干杯！！