模式匹配的基本子串搜索

Question

如何根据模式从postgresql中的列中提取子字符串？

        RESULTS
        --------------------------------------------
        {"searchtext":"apple","Source":null,"User":null}
        {"searchtext":"banana","Source":null,"User":null}
        {"searchtext":"mango","Source":null,"User":null}

所需的输出是：

        FINAL_RESULT
        --------------------------------------------
        apple
        banana
        mango

这是我写的，它不起作用：

        select substring(af.RESULTS from '{"searchtext":"(.)","Source":null,"User":null}') as FINAL_RESULT from table af;

Answer 1

想出来。我错过了'+'字符。

        select substring(af.RESULTS from '{"searchtext":"(.+)","Source":null,"User":null}') as FINAL_RESULT from table af;