Dot NET Regular Expression

Hi, in this post, I will demonstrate how to use a Regular Expression using the Dot NET Framework. If you are new to Regular Expressions, this post would not be of much use. This is intended for an audience who knows regular expressions and need to implement a regular expression in their Dot NET code.
There may be scenarios where you need to match a certain string with a Regular Expression. Using the Dot NET Framework, this becomes relatively easy.

First, you need to import the namespace by defining

using System.Text.RegularExpressions;

Then, you can create a Regex object by calling its constructor. This is an overloaded constructor. I will show only one use of it. (You can explore the other!!!)

Regex regularExpression = new Regex("");

This would create a Regex object. Once created, you can call several methods to get the job done.
I will show how the Replace method can be used to identify a character pattern and replace it with a character set of your own. (A good example is when you want to replace offensive words entered by a user with asterisks in a social networking site)

Regex regularExpression = new Regex("ruchira[a-z]*");
string filteredWords = regularExpression.Replace("ruchira", "*");

After performing the above, the result would be a single asterix. ie: "ruchira" would be replaced by "*"

I believe this is a good point to start with Regular Expressions, you can continue exploring its other functionalities.

Cheers !!!!!!!!

Comments

Post a Comment

Popular posts from this blog

Encrypt and Decrypt Images Using Java

Hi, Most of you would find it useful to Encrypt a special picture of yours such that only you can view it. By using JCE(Java Cryptography Extension) classes, this becomes very simple. As I have already done before using Java to encrypt a String is very simple. If you are new to this, please read the article which I had already posted named "Java Encryption and Decryption" at "http://ruchiram4.blogspot.com/2009/04/java-encryption-and-decryption.html" Also, you need to have a basic understanding of Java IO. If you are new, it is better to read the Sun Java tutorial on IO. Before we move on, lets recall the basic steps in Encrypting plaintext. 1. Creating an instance of "Cipher" object and setting the mode of Encryption (Eg: AES, DES) 2. Generating a key by using a KeyGenerator object. 3. Setting the mode of Cipher operation on the Cipher object. As we intent to Encrypt, we simply set it by setting a property of Cipher object by calling its "init"
Read more

Build your own Network sniffer

Image
Recently, I ve been developing a tool to monitor the Network Traffic as an assignment. Here, I wish to share my experience with all of you who are interested in building your own Sniffer. Prerequisites : Java Programming capability, Knowledge on OOP(Object Oriented Programming) basics My Environment: I used the libraries specified for Java which is widely available. I ran my application on Windows XP only. But the libraries can be easily integrated with Linux based systems. I used NetBeans 6.1 version for development activities. But any other java IDE would do In setting up the environment, first you need to download Jpcap jar found at http://sourceforge.net/projects/jpcap Once you download this, you have to add this to your NetBeans project. It can be done as follows. After adding the Jar file to the project, you need to download the WinPCap driver. It can be easily downloaded from http://www.winpcap.org/ It is required to get low level networking access regarding packets. As for
Read more

ASP Response.Write newline

Hi, all of you who have used ASP may have encountered situations where you require to write a text output to the screen. It can be easily done by using Response.Write("Hello world"); However, if you wish to append some more text to a newline, it would not work in the following ways. Response.Write("Hello world \n"); Response.Write("Good day."); The output of the above lines would be Hello world Good day. and NOT Hello world Good day. In order to overcome this, you can very simple place an html break tag inside the code. Response.Write("Hello world"); Response.Write("<br/>"); Response.Write("Good day."); The output would be the following. Hello world Good day. Cheers !!!
Read more