Regular expression in javascript?

Question

Hi, i want to know how to write the regular expression in javascirpt please help me give a simple exaple with details i mean the source code(i am using asp.net and c# language) thank u

Answer 1

You may want to refer concise article on : www.regular-expressions.info/javascript.html

First you need to understand the concept of regular expression. Once you know what regex is, writing them in any language is not difficult.

Answer 2

You can read these

Regular Expressions

Regular Expressions patterns

String and Regular Expression methods

If you are interested in buying a regex book then this one is good

Regular Expressions Cookbook

Answer 3

You can write a regular expression literal enclosed in slashes like this:

var re = /\w+/;

That matches something that contains one or more word characters.

You can also create a regular expression from a string:

var re = new RegExp("\\w+");

Notice that since that's a string literal, I have to double the backslash to escape its special meaning for strings.

Answer 4

There are tons of examples online for using JavaScript's RegExp object. Start with this.

Here is a simple example of creating a RegExp and then using it to determine whether there is at least one occurrence of the word "dog" in the passed string.

var myString = "I wish all dogs were brown.";
var myRegExp = new RegExp("dog");
var containsDog = myRegExp.test(myString);

In this example, containsDog would be 'true'.

Answer 5

I think the following articles from Mozilla Dev Center are a very good introduction:

• Regular Expressions.
• Working with Regular Expressions.
• Examples of Regular Expressions.

Answer 6

This should also work:

var myString = "I wish all dogs were brown.";
if (myString.match(/dog/i))
{
    //do something
}