Regular expression in javascript?

I want to know how to write the regular expression in javascript. Please help me. Give a simple example with details. I mean the source code (i am using asp.net开发者_运维问答 and c# language).

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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'.

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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.

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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

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

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

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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.

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This should also work:

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