Mysql Regular Expression query and instance

Mysql tutorial Regular Expression query and instance
 
^ Match the start part of the string
$ Match the end part of a string
$ SQL = "SELECT 'fonfo 'regexp '^ fo $' from string_find ";
 
. Match any character (including carriage return and new line)
$ SQL = "SELECT 'fofofo' REGEXP '^ f. * $' from string_find ";
 
A * matches any sequence of 0 or multiple a characters
 
$ SQL = "SELECT 'Ban 'regexp' ^ Ba * n' from string_find ";
 
A + matches any sequence of one or more a characters
 
$ SQL = "SELECT 'Ban 'regexp' ^ Ba + N' from string_find ";
 
 
A? Match 0 or 1 a character
 
$ SQL = "SELECT 'bn 'regexp '^ Ba? N' from string_find ";

De | abc matching sequence de or abc
(Abc) * matches 0 or multiple instances of the sequence abc.
The {1}, {2, 3} {n} or {m, n} symbol provides a more common way to write regular expressions, many of the aforementioned atoms (or "parts") that can match the pattern "). Both m and n are integers.
O *
Can be written as a {0 ,}.
 
O a +
 
Can be written as a {1 ,}.
 
O?
 
Can be written as a {0, 1 }.
 
More accurately, a {n} exactly matches n instances of. A {n,} matches n or more instances of. A {m, n} matches m ~ of ~ N instances, including m and n.
 
M and n must be between 0 and ~ The range of RE_DUP_MAX (255 by default) includes 0 and RE_DUP_MAX. If both m and n are given, m must be less than or equal
[A-dX], [^ a-dX] matches any character that is (or is not, if ^ is used) a, B, c, d, or X. The "-" character between two other characters constitutes a range, and matches all characters starting from 1st characters to 2nd characters. For example, [0-9] matches any decimal number. To include the text character "]", it must be followed by the brackets. To contain the text character "-", it must be written first or last. For any character that does not define any special meaning for [], it only matches itself.
[. Characters.] In the brackets expression (using [and]), match the character sequence used for checking the element. The character is a single character or a new line or another character name. In the regexp/cname. h file, you can find the complete list of character names.
 
First, log in to a database tutorial cc,
 
Create database cc;
 
Create a table
 
Create table if not exists 'string _ find '(
'Id' int (4) not null auto_increment,
'Charlist' varchar (100) default NULL,
Primary key ('id ')
) ENGINE = MyISAM default charset = utf8 AUTO_INCREMENT = 7;
 
Import Test Data
 
Insert into 'string _ find '('id', 'charlist') VALUES
(1, 'Pioneer Deng '),
(2, 'Pioneer Deng '),
(5, 'fdafdsaf '),
(6, 'www. bKjia. c0m ');
 
Now everything is ready.
 
*/

$ DbHost = 'localhost'; // It can be unchanged.
$ DbUser = 'root'; // your mysql user name
$ DbPass = 'root'; // change it to your mysql server password
$ Db = 'cc ';
$ Charset = 'gbk ';

$ Conn = mysql_pconnect ($ dbHost, $ dbUser, $ dbPass) or die (mysql_error ());
Mysql_select_db ($ db, $ conn );
Mysql_query ("set Names '$ charset '");

$ SQL = 'select * from string_find where charList REGEXP "^ Deng "';
$ Query = mysql_query ($ SQL );
If (mysql_num_rows ($ query ))
{
While ($ rs = mysql_fetch_array ($ query ))
{
Echo $ rs [1], '<br/> ';
}
}
Else
{
Exit ('no related record found ');
}

/*
The results are different, but the mysql regular expression is used.

This article was originally published on the first stop of www. bKjia. c0m Chinese WEB.