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SQL / MySQL » Regular Expression » Introduction 
1.Regular Expressions
2.Group the alternatives within parentheses, the ^ and $ will apply to both of them
3.The asterisk (*) indicates zero or more.
4.Limit the match on the 'i' to either zero or one.
5.As the plus sign (+) indicates that g had to appear one or more times
6.{3,} means the a must occur at least three times
7.MySQL's regular expression capabilities also support POSIX character classes.
8.Using Operators in Your SQL Statements
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
14.Where clause: regular expression 2
15.show records where the name has 6 characters
16.A regular expression matches anywhere in the string.
17.Match only aaa
18.To match abcabcabc, you need to use parentheses
19.Regular expression and postcode
20.Regular expression and street value
21.Regular expression: or
22.Parentheses indicate an entire character string, and curly braces indicate how many times the character string
23.Square brackets indicate a selection from among several characters, a hyphen is used to indicate a range of ch
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