Regular Expression in C#

Different Regular Expressions used in C# are.

White space is not allowed:

(\S)+

Alphabets and Space:

[a-zA-Z ]+$

Alphabets:

^[A-z]+$

Numbers:

^[0-9]+$

Alphanumeric:

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

Email Address:

[a-z0-9!#$%&’*+/=?^_`{|}~-]+(?:\\.[a-z0-9!#$%&’*+/=?^_`{|}~-]+)*@(?:[a-z0-9](?:[a-z0-9-]*[a-z0-9])?\\.)+[a-z0-9](?:[a-z0-9-]*[a-z0-9])?

Mobile Number:

^([7-9]{1})([0-9]{9})$

Date Format ( mm/dd/yyyy | mm-dd-yyyy | mm.dd.yyyy ):

/^(0[1-9]|1[012])[- /.](0[1-9]|[12][0-9]|3[01])[- /.](19|20)\\d\\d+$/

 Website URL:

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

Credit Card Numbers:

Visa:
^4[0-9]{12}(?:[0-9]{3})?$

MasterCard:
^5[1-5][0-9]{14}$

American Express:
^3[47][0-9]{13}$

Decimal number:
((\\d+)((\\.\\d{1,2})?))$

IFSC CODE:
^[^\s]{4}\d{7}$

PAN CARD:
^([a-zA-Z]){5}([0-9]){4}([a-zA-Z]){1}?$