mysql正则替换 正宗！

先看个官方例子

mysql> SELECT REGEXP_REPLACE('a b c', 'b', 'X');
+-----------------------------------+
| REGEXP_REPLACE('a b c', 'b', 'X') |
+-----------------------------------+
| a X c                             |
+-----------------------------------+
mysql> SELECT REGEXP_REPLACE('abc def ghi', '[a-z]+', 'X', 1, 3);
+----------------------------------------------------+
| REGEXP_REPLACE('abc def ghi', '[a-z]+', 'X', 1, 3) |
+----------------------------------------------------+
| abc def X                                          |
+----------------------------------------------------+

REGEXP_REPLACE(expr, pat, repl[, pos[, occurrence[, match_type]]])

Replaces occurrences in the string expr that match the regular expression specified by the pattern pat with the replacement string repl, and returns the resulting string. If expr, pat, or repl is NULL, the return value is NULL.

REGEXP_REPLACE() takes these optional arguments:

pos: The position in expr at which to start the search. If omitted, the default is 1.

occurrence: Which occurrence of a match to replace. If omitted, the default is 0 (which means “replace all occurrences”).

match_type: A string that specifies how to perform matching. The meaning is as described for REGEXP_LIKE().

Prior to MySQL 8.0.17, the result returned by this function used the UTF-16 character set; in MySQL 8.0.17 and later, the character set and collation of the expression searched for matches is used. (Bug #94203, Bug #29308212)

For additional information about how matching occurs, see the description for REGEXP_LIKE().

来个人干的事情：

SELECT REGEXP_REPLACE('哇啦哇啦（报警）', '(.*?)（(.*)）', '$1$2');
| 哇啦哇啦报警

看来也是支持分组捕获的