Javascript regex for validating url

25 Dec

August 2014: Lately I've added many new regex pages and been making major overhauls to old ones. Once you learn it, you discover it comes in handy in many places where you hadn't planned to use it.I have not yet had time to revise this page, so please be aware that it is not up the same standard as most pages in the tutorial. On this page, we'll first look at a number of contexts and programs where you may find regex.Then we'll have a quick look at some regex flavors you may run into.Finally, we'll study some examples of regex patterns in contexts such as: ✽ File Renaming ✽ Text Search ✽ Web directives (Apache) ✽ Database queries (My SQL) Disclaimer: I haven't edited this page in a while.In most of the cases, we tend to use regular expressions for validation.In the case of a URL, finding a regular expression that validates every type of URL possible is very difficult.

Right now the module focuses on HTTP URIs, since they're arguably the most common.

Even more if you manage to find one, the regular expression will be highly complex.

Why do all this when the browser is providing a HTML Regardless of the fact that you're doing client side validation with Javascript, do not forget to validate form fields on the server as well (with PHP or something).

A regular expression is a sequence of characters that forms a search pattern.

When you search for data in a text, you can use this search pattern to describe what you are searching for.