Check Palindrome

HTML mailto Attribute's Example

Swap two variables without using any third variable

String Reverse Program in C

General Regular Expressions.

Some General Regular Expressions are:

for more details, please refer:
http://www.regexlib.com

Credit Card Validation's Regular Expression

Regular Expression For Credit Cards (Like: VISA, MasterCard, American Express, Diners Club, enRoute, Discover and JCB)