Regular Expressions is a engine and formatted which used finding the instance of one string with in another.

The several programming languages like .net, JavaScript, PHP, PERL, Java etc supported Regular Expressions.

The Regular Expression engine is software that can process regular expression Any person can't access directly Regular Expression,

This engine is a part of large programming application.

Use of Regular Expressions-

There are most use of regular expression in validation, and checking the email address like @ and (.) symbols.

In the web application it would work well for:

Input validation

Verifying input format, email address, example

Searching and replacing data (according Requirement) from file to database.

Parsing data from pre-defined variable.

To written sue form data contains valid Information such as @ and Dot (.) symbol in email address.

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