Regular expression for URL validation (in JavaScript)

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In the accepted answer bobince got it right: validating only the scheme name, ://, and spaces and double quotes is usually enough. Here is how the validation can be implemented in JavaScript:

var url="http://www.google.com";
var valid = /^(ftp|http|https):\/\/[^ "]+$/.test(url);
// true

or

var r = /^(ftp|http|https):\/\/[^ "]+$/;
r.test('http://www.goo le.com');
// false

or

var url="http:www.google.com";
var r = new RegExp(/^(ftp|http|https):\/\/[^ "]+$/);
r.test(url);
// false

References for syntax:

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