Check if link is valid

[Thew]

I want a snippet that check if the website link is valid. For example:

www.example

returns FALSE

www.example.com

returns TRUE

www.example.co. uk

returns TRUE

www.lol.lol.lol .lol

returns FALSE

lol.example.com

returns TRUE



But how can i check that?

[Atli]

There are two methods, in general, to do things like that. String manipulation and Regular Expressions. - I would be very surprised if you couldn't find a handful of examples for both via Google.

However, in the case of emails and URLs, you can use the filter_var function instead. (See the example.)

[dlite922]

Welcome back Thew,

With a regular expression with PHP's preg_match(). There are some you can find on google. you might need to tweak it for your use.

Regex Buddy is a tool I love to do regexps with. It also has some libraries of built-in expressions you can use.

To start you off, here's what yours might look like:

^[a-z]+\.[a-z]+\.([a-z]{3}|[a-z]{2}\.[a-z]{2})$

The above matches with your examples above but will fail for domains like

customer.suppor t.company.com


Cheers,

Dan

[Dormilich]

www.lol.lol.lol .lol

returns FALSE

why should that not be an URL? from the syntax point-of-view, this validates as URL, although the TLD (Top Level Domain) is currently invalid