Regular Expressions Validation for .Net Form

 A regular expression is a set of characters that specify a pattern. The term "regular" has nothing to do with a high-fiber diet. It comes from a term used to describe grammars and formal languages.

Regular Expression Example:

"^[a-zA-Z0-9_]*$"

This works for .NET regular expressions, and probably a lot of other languages as well.

Breaking it down:

^ : start of string

[ : beginning of character group

a-z : any lowercase letter

A-Z : any uppercase letter

0-9 : any digit

_ : underscore

] : end of character group

* : zero or more of the given characters

$ : end of string

Some Regular Expression for Registration form in .net.

1.Without charecter numaric not allow:

^[a-zA-Z][a-zA-Z0-9().@_\s]+$

2."Enrolment no” Validate for 7 digits (first 3 digits alphabets and next 4 digits numeric)

[a-zA-Z]{3}\d{4}

3.Enter First Name, It should be Greater Than 2 Characters, Numeric value is not allowed, And space is also not allowed in Personal Details Block"

[A-Za-z]{3,}

4.Remove Space From login

^[^\s]+$

5.Loginid should contain [6 to 15 character] with no special Character

^[a-zA-Z0-9\'\.\,\-\+\*\%\(\)]{6,15}$

6.Loginid should contain [6 to 15 character] at least one digit [0-9], one alphabet [A-Z] [a-z] and one special character [@#&*!].

(?=^.{6,15}$)(?=.*\d)(?=.*\W+)(?![.\n])(?=.*[a-zA-Z]).*$

7.Enter 6 Digits Password

[0-9]{6,}

8.Enter Valid official Mobile No of 10 Digits Starting with 7/8/9 In Office Address Block

^[789]\d{9}$

9.Invalid Official EMailID In Office Address Block

\w+([-+.']\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*

10.Enter Valid Website In Office Address Block

http://([\w-]+\.)+[\w-]+(/[\w- ./?%&=]*)?

11.JPEG/GIF/PNG files only allowed

^.*\.((j|J)(p|P)(e|E)?(g|G)|(g|G)(i|I)(f|F)|(p|P)(n|N)(g|G))$

12.Enter Father Name and it should be Greater Than 2 Character And Numeric value is not allowed.

.{2}.*

Regular Expression	Matches
^A	"A" at the beginning of a line
A$	"A" at the end of a line
A^	"A^" anywhere on a line
$A	"$A" anywhere on a line
^^	"^" at the beginning of a line
$$	"$" at the end of a line

Regular Expression	Matches
[]	The characters "[]"
[0]	The character "0"
[0-9]	Any number
[^0-9]	Any character other than a number
[-0-9]	Any number or a "-"
[0-9-]	Any number or a "-"
[^-0-9]	Any character except a number or a "-"
[]0-9]	Any number or a "]"
[0-9]]	Any number followed by a "]"
[0-9-z]	Any number, or any character between "9" and "z".
[0-9\-a\]]	Any number, or a "-", a "a", or a "]"

          

Regular Expression	Matches
*	Any line with an asterisk
\*	Any line with an asterisk
\\	Any line with a backslash
^*	Any line starting with an asterisk
^A*	Any line
^A\*	Any line starting with an "A*"
^AA*	Any line if it starts with one "A"
^AA*B	Any line with one or more "A"'s followed by a "B"
^A\{4,8\}B	Any line starting with 4, 5, 6, 7 or 8 "A"'s
	followed by a "B"
^A\{4,\}B	Any line starting with 4 or more "A"'s
	followed by a "B"
^A\{4\}B	Any line starting with "AAAAB"
\{4,8\}	Any line with "{4,8}"
A{4,8}	Any line with "A{4,8}"

Regular Expression	Class	Type	Meaning
.	all	Character Set	A single character (except newline)
^	all	Anchor	Beginning of line
$	all	Anchor	End of line
[...]	all	Character Set	Range of characters
*	all	Modifier	zero or more duplicates
\<	Basic	Anchor	Beginning of word
\>	Basic	Anchor	End of word
\(..\)	Basic	Backreference	Remembers pattern
\1..\9	Basic	Reference	Recalls pattern
_+	Extended	Modifier	One or more duplicates
?	Extended	Modifier	Zero or one duplicate
\{M,N\}	Extended	Modifier	M to N Duplicates
(...|...)	Extended	Anchor	Shows alteration
_
\(...\|...\)	EMACS	Anchor	Shows alteration
\w	EMACS	Character set	Matches a letter in a word
\W	EMACS	Character set	Opposite of \w

Regular Expression	Type	Meaning
\t	Character Set	tab
\n	Character Set	newline
\r	Character Set	return
\f	Character Set	form
\a	Character Set	alarm
\e	Character Set	escape
\033	Character Set	octal
\x1B	Character Set	hex
\c[	Character Set	control
\l	Character Set	lowercase
\u	Character Set	uppercase
\L	Character Set	lowercase
\U	Character Set	uppercase
\E	Character Set	end
\Q	Character Set	quote
\w	Character Set	Match a "word" character
\W	Character Set	Match a non-word character
\s	Character Set	Match a whitespace character
\S	Character Set	Match a non-whitespace character
\d	Character Set	Match a digit character
\D	Character Set	Match a non-digit character
\b	Anchor	Match a word boundary
\B	Anchor	Match a non-(word boundary)
\A	Anchor	Match only at beginning of string
\Z	Anchor	Match only at EOS, or before newline
\z	Anchor	Match only at end of string
\G	Anchor	Match only where previous m//g left off