Where clause: regular expression 2 : Introduction « Regular Expression « SQL / MySQL






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Where clause: regular expression 2

    
/*
mysql> Drop table Sale;
Query OK, 0 rows affected (0.01 sec)

mysql> CREATE TABLE Sale
    -> (
    ->    ID SMALLINT NOT NULL AUTO_INCREMENT PRIMARY KEY,
    ->    Name VARCHAR(50) NOT NULL,
    ->    InStock SMALLINT UNSIGNED NOT NULL,
    ->    OnOrder SMALLINT UNSIGNED NOT NULL,
    ->    Reserved SMALLINT UNSIGNED NOT NULL,
    ->    Department ENUM('Classical', 'Popular') NOT NULL,
    ->    Category VARCHAR(20)
    -> );
Query OK, 0 rows affected (0.08 sec)

mysql> INSERT INTO Sale (Name,      InStock, OnOrder, Reserved, Department, Cate
gory)
    -> VALUES          ('Bloodshot', 11,      6,       1,        'Popular',  'Ro
ck'),
    ->                 ('Opera',     12,      5,       2,        'Classical','Op
era'),
    ->                 ('Jazz',      13,      4,       3,        'Popular',  'Ja
zz'),
    ->                 ('Music',     4,       3,       4,        'Classical','Da
nce'),
    ->                 ('Violin',    25,      2,       5,        'Classical', NU
LL),
    ->                 ('Toscana',   16,      1,       6,        'Classical', NU
LL),
    ->                 ('Blues',     7,       22,      7,        'Popular',   'B
lues'),
    ->                 ('Pure',      38,      5,       11,       'Popular',   NU
LL),
    ->                 ('Mud',       19,      11,      12,       'Popular',  'Co
untry'),
    ->                 ('Essence',   5,       23,      12,       'Popular', 'New
 Age'),
    ->                 ('Embrace',   21,      12,      14,       'Popular', 'New
 Age'),
    ->                 ('Satie',     42,      17,      15,       'Classical', NU
LL),
    ->                 ('Lake',      23,      47,      28,       'Classical', 'D
ance'),
    ->                 ('Favorites', 34,      15,      12,       'Classical', 'G
eneral'),
    ->                 ('Boheme',    25,      12,       5,       'Classical', 'O
pera'),
    ->                 ('Cantatas',  26,      13,      8,        'Classical', 'G
eneral'),
    ->                 ('Road',      27,      13,      17,       'Popular', 'Cou
ntry'),
    ->                 ('Paris',     18,      25,      10,       'Popular', 'Jaz
z'),
    ->                 ('Woman',     29,      4,        7,       'Popular', 'Blu
es'),
    ->                 ('Bach',      21,      13,      16,       'Classical', 'G
eneral'),
    ->                 ('Opera',     12,      32,      12,       'Classical', 'O
pera'),
    ->                 ('Soul',      13,      30,      14,       'Popular', NULL
),
    ->                 ('Stages',    44,      0,       8,        'Popular', 'Blu
es'),
    ->                 ('Bach',      15,      1,       8,        'Classical', 'G
eneral');
Query OK, 24 rows affected (0.00 sec)
Records: 24  Duplicates: 0  Warnings: 0

mysql> select * from Sale;
+----+-----------+---------+---------+----------+------------+----------+
| ID | Name      | InStock | OnOrder | Reserved | Department | Category |
+----+-----------+---------+---------+----------+------------+----------+
|  1 | Bloodshot |      11 |       6 |        1 | Popular    | Rock     |
|  2 | Opera     |      12 |       5 |        2 | Classical  | Opera    |
|  3 | Jazz      |      13 |       4 |        3 | Popular    | Jazz     |
|  4 | Music     |       4 |       3 |        4 | Classical  | Dance    |
|  5 | Violin    |      25 |       2 |        5 | Classical  | NULL     |
|  6 | Toscana   |      16 |       1 |        6 | Classical  | NULL     |
|  7 | Blues     |       7 |      22 |        7 | Popular    | Blues    |
|  8 | Pure      |      38 |       5 |       11 | Popular    | NULL     |
|  9 | Mud       |      19 |      11 |       12 | Popular    | Country  |
| 10 | Essence   |       5 |      23 |       12 | Popular    | New Age  |
| 11 | Embrace   |      21 |      12 |       14 | Popular    | New Age  |
| 12 | Satie     |      42 |      17 |       15 | Classical  | NULL     |
| 13 | Lake      |      23 |      47 |       28 | Classical  | Dance    |
| 14 | Favorites |      34 |      15 |       12 | Classical  | General  |
| 15 | Boheme    |      25 |      12 |        5 | Classical  | Opera    |
| 16 | Cantatas  |      26 |      13 |        8 | Classical  | General  |
| 17 | Road      |      27 |      13 |       17 | Popular    | Country  |
| 18 | Paris     |      18 |      25 |       10 | Popular    | Jazz     |
| 19 | Woman     |      29 |       4 |        7 | Popular    | Blues    |
| 20 | Bach      |      21 |      13 |       16 | Classical  | General  |
| 21 | Opera     |      12 |      32 |       12 | Classical  | Opera    |
| 22 | Soul      |      13 |      30 |       14 | Popular    | NULL     |
| 23 | Stages    |      44 |       0 |        8 | Popular    | Blues    |
| 24 | Bach      |      15 |       1 |        8 | Classical  | General  |
+----+-----------+---------+---------+----------+------------+----------+
24 rows in set (0.00 sec)

mysql> SELECT Name, InStock
    -> FROM Sale
    -> WHERE Name REGEXP '^[mn].*[sz]$'
    -> ORDER BY Name;
Empty set (0.00 sec)


*/

Drop table Sale;


CREATE TABLE Sale
(
   ID SMALLINT NOT NULL AUTO_INCREMENT PRIMARY KEY,
   Name VARCHAR(50) NOT NULL,
   InStock SMALLINT UNSIGNED NOT NULL,
   OnOrder SMALLINT UNSIGNED NOT NULL,
   Reserved SMALLINT UNSIGNED NOT NULL,
   Department ENUM('Classical', 'Popular') NOT NULL,
   Category VARCHAR(20)
);


INSERT INTO Sale (Name,      InStock, OnOrder, Reserved, Department, Category)
VALUES          ('Bloodshot', 11,      6,       1,        'Popular',  'Rock'),
                ('Opera',     12,      5,       2,        'Classical','Opera'),
                ('Jazz',      13,      4,       3,        'Popular',  'Jazz'),
                ('Music',     4,       3,       4,        'Classical','Dance'),
                ('Violin',    25,      2,       5,        'Classical', NULL),
                ('Toscana',   16,      1,       6,        'Classical', NULL),
                ('Blues',     7,       22,      7,        'Popular',   'Blues'),
                ('Pure',      38,      5,       11,       'Popular',   NULL),
                ('Mud',       19,      11,      12,       'Popular',  'Country'),
                ('Essence',   5,       23,      12,       'Popular', 'New Age'),
                ('Embrace',   21,      12,      14,       'Popular', 'New Age'),
                ('Satie',     42,      17,      15,       'Classical', NULL),
                ('Lake',      23,      47,      28,       'Classical', 'Dance'),
                ('Favorites', 34,      15,      12,       'Classical', 'General'),
                ('Boheme',    25,      12,       5,       'Classical', 'Opera'),
                ('Cantatas',  26,      13,      8,        'Classical', 'General'),
                ('Road',      27,      13,      17,       'Popular', 'Country'),
                ('Paris',     18,      25,      10,       'Popular', 'Jazz'),
                ('Woman',     29,      4,        7,       'Popular', 'Blues'),
                ('Bach',      21,      13,      16,       'Classical', 'General'),
                ('Opera',     12,      32,      12,       'Classical', 'Opera'),
                ('Soul',      13,      30,      14,       'Popular', NULL),
                ('Stages',    44,      0,       8,        'Popular', 'Blues'),
                ('Bach',      15,      1,       8,        'Classical', 'General');
  
select * from Sale;

SELECT Name, InStock
FROM Sale
WHERE Name REGEXP '^[mn].*[sz]$'
ORDER BY Name;








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6.{3,} means the a must occur at least three times
7.MySQL's regular expression capabilities also support POSIX character classes.
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9.If you wish to encompass the entire character string, you must use ^ and $ in the search:
10.Name and regular expression
11.String with exact length
12.String case in regular expression
13.Where clause: regular expressions
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15.A regular expression matches anywhere in the string.
16.Match only aaa
17.To match abcabcabc, you need to use parentheses
18.Regular expression and postcode
19.Regular expression and street value
20.Regular expression: or
21.Parentheses indicate an entire character string, and curly braces indicate how many times the character string
22.Square brackets indicate a selection from among several characters, a hyphen is used to indicate a range of ch