mysql - 正则表达式示例与官方文档结果不匹配

Question

来自 MySQL 文档：

https://dev.mysql.com/doc/refman/8.0/en/regexp.html（MySQL 8.0）：

mysql> SELECT 'new*\n*line' REGEXP 'new\\*.\\*line';
+---------------------------------------+
| 'new*\n*line' REGEXP 'new\\*.\\*line' |
+---------------------------------------+
|                                     0 |
+---------------------------------------+

和https://dev.mysql.com/doc/refman/5.7/en/regexp.html（MySQL 5.7）：

mysql> SELECT 'new*\n*line' REGEXP 'new\\*.\\*line';
+---------------------------------------+
| 'new*\n*line' REGEXP 'new\\*.\\*line' |
+---------------------------------------+
|                                     0 |
+---------------------------------------+

但是为什么我1在 MySQL 5.7 和0MySQL 5.8 中有？

Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 2212
Server version: 5.7.33-0ubuntu0.18.04.1 (Ubuntu)

Copyright (c) 2000, 2021, Oracle and/or its affiliates.

Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

mysql> SELECT 'new*\n*line' REGEXP 'new\\*.\\*line';
+---------------------------------------+
| 'new*\n*line' REGEXP 'new\\*.\\*line' |
+---------------------------------------+
|                                     1 |
+---------------------------------------+
1 row in set (0.00 sec)

mysql>


===========

Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 1107
Server version: 8.0.23 MySQL Community Server - GPL

Copyright (c) 2000, 2021, Oracle and/or its affiliates.

Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

mysql>
mysql> SELECT 'new*\n*line' REGEXP 'new\\*.\\*line';
+---------------------------------------+
| 'new*\n*line' REGEXP 'new\\*.\\*line' |
+---------------------------------------+
|                                     0 |
+---------------------------------------+
1 row in set (0.00 sec)

mysql>

我很困惑。哪个应该是正确的？至于我，我认为它匹配..

标签： mysql