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正则表达式查询

查询特定字符或字符串开头的记录

字符‘^’匹配以特定字符或字符串开头的文本

mysql> SELECT *    -> FROM fruits    -> WHERE f_name REGEXP '^x';+------+------+---------+---------+| f_id | s_id | f_name  | f_price |+------+------+---------+---------+| b5   |  107 | xxxx    |    3.60 || m2   |  105 | xbabay  |    2.60 || t4   |  107 | xbababa |    3.60 |+------+------+---------+---------+3 rows in set (0.00 sec)

2查询以xx开头的记录

mysql> SELECT *    -> FROM fruits    -> WHERE f_name REGEXP '^xx';+------+------+--------+---------+| f_id | s_id | f_name | f_price |+------+------+--------+---------+| b5   |  107 | xxxx   |    3.60 |+------+------+--------+---------+1 row in set (0.00 sec)

查询特定字符或字符串结尾的记录

字符$匹配以特定字符或字符串结尾的文本

mysql> SELECT *    -> FROM fruits    -> WHERE f_name REGEXP 'e$';+------+------+--------+---------+| f_id | s_id | f_name | f_price |+------+------+--------+---------+| a1   |  101 | apple  |    5.20 || bs1  |  102 | orange |   11.20 || t2   |  102 | grape  |    5.30 |+------+------+--------+---------+3 rows in set (0.00 sec)

2.查询以go结尾的记录

mysql> SELECT *    -> FROM fruits    -> WHERE f_name REGEXP 'go$';+------+------+--------+---------+| f_id | s_id | f_name | f_price |+------+------+--------+---------+| m1   |  106 | mngo   |   15.70 |+------+------+--------+---------+1 row in set (0.00 sec)

用符号.来代替字符串中任一字符

字符.匹配任意一个字符

mysql> SELECT *    -> FROM fruits    -> WHERE f_name REGEXP 'r.y';+------+------+------------+---------+| f_id | s_id | f_name     | f_price |+------+------+------------+---------+| b1   |  101 | blackberry |   10.20 || b2   |  104 | berry      |    7.60 || c0   |  101 | cherry     |    3.20 |+------+------+------------+---------+3 rows in set (0.00 sec)

用符号“*”和“+”来匹配多个字符

“*”可匹配前面多个字符，“+”至少匹配前面字符一次

mysql> SELECT *    -> FROM fruits    -> WHERE f_name REGEXP '^mn*';+------+------+--------+---------+| f_id | s_id | f_name | f_price |+------+------+--------+---------+| bs2  |  105 | melon  |    8.20 || m1   |  106 | mngo   |   15.70 |+------+------+--------+---------+2 rows in set (0.00 sec)

mysql> SELECT *    -> FROM fruits    -> WHERE f_name REGEXP '^mn+';+------+------+--------+---------+| f_id | s_id | f_name | f_price |+------+------+--------+---------+| m1   |  106 | mngo   |   15.70 |+------+------+--------+---------+1 row in set (0.00 sec)

匹配指定字符串

正则表达式可以匹配指定的字符串，只要这个字符串在查询文本中即可，如果要匹配多个字符串，多个字符串之间使用分隔符"|"隔开

1.查询包含字符串“ge”的记录

mysql> SELECT *    -> FROM fruits    -> WHERE f_name REGEXP 'ge';+------+------+--------+---------+| f_id | s_id | f_name | f_price |+------+------+--------+---------+| bs1  |  102 | orange |   11.20 |+------+------+--------+---------+1 row in set (0.00 sec)

2.查询包含“ge”或者"na"的记录

mysql> SELECT *    -> FROM fruits    -> WHERE f_name REGEXP 'ge|na';+------+------+--------+---------+| f_id | s_id | f_name | f_price |+------+------+--------+---------+| bs1  |  102 | orange |   11.20 || t1   |  102 | banana |   10.30 |+------+------+--------+---------+2 rows in set (0.00 sec)

匹配指定字符中的任意一个

方括号“[]”指定一个字符集合，只匹配其中任何一个字符。

mysql> SELECT *    -> FROM fruits    -> WHERE f_name REGEXP '[ae]';+------+------+------------+---------+| f_id | s_id | f_name     | f_price |+------+------+------------+---------+| a1   |  101 | apple      |    5.20 || a2   |  103 | apricot    |    2.20 || b1   |  101 | blackberry |   10.20 || b2   |  104 | berry      |    7.60 || bs1  |  102 | orange     |   11.20 || bs2  |  105 | melon      |    8.20 || c0   |  101 | cherry     |    3.20 || m2   |  105 | xbabay     |    2.60 || t1   |  102 | banana     |   10.30 || t2   |  102 | grape      |    5.30 || t4   |  107 | xbababa    |    3.60 |+------+------+------------+---------+11 rows in set (0.00 sec)

使用{n,}或者{n,m}来指定字符串出现的次数

查询至少连续出现2次r的记录

mysql> SELECT *    -> FROM fruits    -> WHERE f_name REGEXP 'r{2,}';+------+------+------------+---------+| f_id | s_id | f_name     | f_price |+------+------+------------+---------+| b1   |  101 | blackberry |   10.20 || b2   |  104 | berry      |    7.60 || c0   |  101 | cherry     |    3.20 |+------+------+------------+---------+3 rows in set (0.00 sec)

匹配指定字符以外的字符

“[^字符集合]”匹配不在指定集合中的任何字符

mysql> SELECT *    -> FROM fruits    -> WHERE s_id REGEXP '[^101-104]';+------+------+---------+---------+| f_id | s_id | f_name  | f_price |+------+------+---------+---------+| a2   |  103 | apricot |    2.20 || b5   |  107 | xxxx    |    3.60 || bs1  |  102 | orange  |   11.20 || bs2  |  105 | melon   |    8.20 || m1   |  106 | mngo    |   15.70 || m2   |  105 | xbabay  |    2.60 || t1   |  102 | banana  |   10.30 || t2   |  102 | grape   |    5.30 || t4   |  107 | xbababa |    3.60 |+------+------+---------+---------+9 rows in set (0.00 sec)

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