MySQL8.0暂时支持如下几种正则表达式函数，本文只是抛砖引玉，更多内容请参考MySQL手册。
| Name | Description |
|---|---|
NOT REGEXP | Negation of REGEXP |
REGEXP | Whether string matches regular expression |
REGEXP_INSTR() | Starting index of substring matching regular expression |
REGEXP_LIKE() | Whether string matches regular expression |
REGEXP_REPLACE() | Replace substrings matching regular expression |
REGEXP_SUBSTR() | Return substring matching regular expression |
RLIKE | Whether string matches regular expression |
regexp、rlike、regexp_like()三者功能相同，只是写法不同
not regexp是否定形式
mysql> select 'abc' regexp '^a';
+-------------------+
| 'abc' regexp '^a' |
+-------------------+
| 1 |
+-------------------+
1 row in set (0.00 sec)
mysql> select 'abc' rlike '^a';
+------------------+
| 'abc' rlike '^a' |
+------------------+
| 1 |
+------------------+
1 row in set (0.00 sec)
mysql> select regexp_like('abc','^a');
+-------------------------+
| regexp_like('abc','^a') |
+-------------------------+
| 1 |
+-------------------------+
1 row in set (0.00 sec)
mysql> select 'abc' not regexp '^a';
+-----------------------+
| 'abc' not regexp '^a' |
+-----------------------+
| 0 |
+-----------------------+
1 row in set (0.00 sec)
mysql> select not regexp_like('abc','^a');
+-----------------------------+
| not regexp_like('abc','^a') |
+-----------------------------+
| 0 |
+-----------------------------+
1 row in set (0.00 sec)regexp_replace()替代函数
mysql> select regexp_replace('a1,b2,c3','[a-z]{1}','b');
+-------------------------------------------+
| regexp_replace('a1,b2,c3','[a-z]{1}','b') |
+-------------------------------------------+
| b1,b2,b3 |
+-------------------------------------------+
1 row in set (0.00 sec)
mysql> select regexp_replace('aaa,b2,c3','[a-z]{2}','d');
+--------------------------------------------+
| regexp_replace('aaa,b2,c3','[a-z]{2}','d') |
+--------------------------------------------+
| da,b2,c3 |
+--------------------------------------------+
1 row in set (0.00 sec)regexp_substr() 截断字符串
mysql> select regexp_substr('a1,b1,c1,ddds','[a-z 0-9]{1,9}',1,1);
+-----------------------------------------------------+
| regexp_substr('a1,b1,c1,ddds','[a-z 0-9]{1,9}',1,1) |
+-----------------------------------------------------+
| a1 |
+-----------------------------------------------------+
1 row in set (0.00 sec)
mysql> select regexp_substr('a1,b1,c1,ddds','[a-z 0-9]{1,9}',1,2);
+-----------------------------------------------------+
| regexp_substr('a1,b1,c1,ddds','[a-z 0-9]{1,9}',1,2) |
+-----------------------------------------------------+
| b1 |
+-----------------------------------------------------+
1 row in set (0.00 sec)
mysql> select regexp_substr('a1,b1,c1,ddds','[a-z 0-9]{1,9}',1,3);
+-----------------------------------------------------+
| regexp_substr('a1,b1,c1,ddds','[a-z 0-9]{1,9}',1,3) |
+-----------------------------------------------------+
| c1 |
+-----------------------------------------------------+
1 row in set (0.00 sec)
mysql> select regexp_substr('a1,b1,c1,ddds','[a-z 0-9]{1,9}',1,4);
+-----------------------------------------------------+
| regexp_substr('a1,b1,c1,ddds','[a-z 0-9]{1,9}',1,4) |
+-----------------------------------------------------+
| ddds |
+-----------------------------------------------------+
1 row in set (0.00 sec)regexp_instr() 返回匹配的字符串开始位置index.
mysql> select regexp_instr('dogcatdog','dog',1);
+-----------------------------------+
| regexp_instr('dogcatdog','dog',1) |
+-----------------------------------+
| 1 |
+-----------------------------------+
1 row in set (0.00 sec)
mysql> select regexp_instr('dogcatdog','dog',2);
+-----------------------------------+
| regexp_instr('dogcatdog','dog',2) |
+-----------------------------------+
| 7 |
+-----------------------------------+
1 row in set (0.00 sec)
mysql> select regexp_instr('a aa aaa aaaa','a{3}',1);
+----------------------------------------+
| regexp_instr('a aa aaa aaaa','a{3}',1) |
+----------------------------------------+
| 6 |
+----------------------------------------+
1 row in set (0.00 sec)更多内容请参考如下链接
