Regular Expressions : Introduction « Regular Expression « SQL / MySQL






  1. SQL / MySQL
  2. Regular Expression
  3. Introduction

Regular Expressions

       


Character     Description
 
*             Matches zero or more instances of the string preceding it
 
+             Matches one or more instances of the string preceding it
 
?             Matches zero or one instances of the string preceding it
 
.             Matches any single character
 
[xyz]         Matches any of x, y, or z (the characters within the brackets)
 
[A-Z]         Matches any uppercase letter
 
[a-z]         Matches any lowercase letter
 
[0-9]         Matches any digit
 
^             Anchors the match from the beginning
 
$             Anchors the match to the end
 
|             Separates strings in the regular expression
 
{n,m}         String must occur at least n times, but no more than n 
 
{n}           String must occur exactly n times
 
{n,|          String must occur at least n times








Related examples in the same category

1.Group the alternatives within parentheses, the ^ and $ will apply to both of them
2.The asterisk (*) indicates zero or more.
3.Limit the match on the 'i' to either zero or one.
4.As the plus sign (+) indicates that g had to appear one or more times
5.{3,} means the a must occur at least three times
6.MySQL's regular expression capabilities also support POSIX character classes.
7.Using Operators in Your SQL Statements
8.If you wish to encompass the entire character string, you must use ^ and $ in the search:
9.Name and regular expression
10.String with exact length
11.String case in regular expression
12.Where clause: regular expressions
13.Where clause: regular expression 2
14.show records where the name has 6 characters
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