Regular Expression Validators

In this article i would like to publish how to understand and write Regular Expression Validators.

Regular Expression Characters

Character	Description
*	Zero or more occurrences of the previous character or subexpression. For example,7*8 matches 7778 or just 8.
+	One or more occurrences of the previous character or subexpression. For example,7+8 matches 7778 but not 8.
()	Groups of subexpression that will be treated as a single element. For example, (78)+ matches 78 and 787878.
{m,n}	The previous character (or subexpression) can occur from m to n times. For example, A{1,3} matches A,AA, or AAA.
|	Either of two matches. For example,8|6 matches 8 or 6.
[]	Matches one character in a range of valid characters. For example,[A-C] matcher A,B or C.
[^]	Matches a character that isn’t in the given range for example, [A-B] matches any character except A and B.
.	Any character except newline. For example, .here matches where and there.
\s	Any whitespace character (such as a tab or space).
\S	Any nonwhite space character.
\d	Any digit character.
\D	Any character that isn’t a digit.
\w	Any “word character (letters, number or underscore).
\W	Any character that isn’t a “word” character (letter, number or underscore).

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