regex_replace，仅替换整个单词

我的PostgreSQL表中有以下行：

kpi_old
---------------------------------
Other operating exp (1200)
Other operating exp (1400)
Other operating exp (1600)
Other operating expenses 0 (1200)
Other operating expenses 0 (1400)
Other operating expenses 0 (1600)

我想替换：

• 其他营业费用

  =>

  其他营业费用和税费

• 其他运营费用0

  =>

  其他运营费用和税费

我尝试了以下方法：

SELECT
"kpi_old",
regexp_replace("kpi_old", '(Other operating exp)','Other operating expenses & taxes') as "kpi_new"

Other operating expenses & taxes (1200)
Other operating expenses & taxes (1400)
Other operating expenses & taxes (1600)
Other operating expenses & taxesenses 0 (1200)
Other operating expenses & taxesenses 0 (1400)
Other operating expenses & taxesenses 0 (1600)

问题是，它返回以下内容：

SELECT
"kpi_old",
regexp_replace("kpi_old", '(Other operating exp)','Other operating expenses & taxes') as "kpi_new"

Other operating expenses & taxes (1200)
Other operating expenses & taxes (1400)
Other operating expenses & taxes (1600)
Other operating expenses & taxesenses 0 (1200)
Other operating expenses & taxesenses 0 (1400)
Other operating expenses & taxesenses 0 (1600)

我可以使用哪个正则表达式替换字符串中的精确匹配？

使用可选组

（ENSE）？

---

使用涵盖以下两个方面的模式：

SELECT regexp_replace(
          kpi_old,
          'Other operating exp(enses 0)?',
          'Other operating expenses & taxes'
       )
FROM mytab;

             regexp_replace              
-----------------------------------------
 Other operating expenses & taxes (1200)
 Other operating expenses & taxes (1400)
 Other operating expenses & taxes (1600)
 Other operating expenses & taxes (1200)
 Other operating expenses & taxes (1400)
 Other operating expenses & taxes (1600)
(6 rows)