如何从oracle中的列中提取子字符串？

Question

我在 oracle 中有一列将值存储在键中。举个例子-

Column_name
((key1="value1" AND key2='value1') OR (key1="value1" AND key2='value2'))
((key1="null" AND key2='value3') OR (key1="value1" AND key2='value4'))

我只想提取 OR 子句之前的 key2 的值​​（因为此列的每一行都有 2 个 key2）

预期结果：

Column_name	Value
((key1="value1" AND key2='value1') OR (key1="value1" AND key2='value2'))	value1
((key1="null" AND key2='value3') OR (key1="value1" AND key2='value4'))	value3

有人可以大致告诉我怎么做吗？

Answer 1

假设我们可以将您的逻辑描述为提取 first key2 值，我们可以尝试将 REGEXP_SUBSTR 与捕获组一起使用：

SELECT col, REGEXP_SUBSTR(col, 'key2=''(.*?)''', 1, 1, NULL, 1) AS key
FROM yourTable;