Input URL Validation - General

[paul2463]

Hi All

Just a quick question, I have a form that companies write their contact details in I wish to validate some of that information, I already validate the email address with the following
[code]
<?php
$regex = "^[A-Z0-9._%-]+@[A-Z0-9.-]+\.[A-Z]{2,4}\$"
if(!preg_match($regex, $email))
die("Invalid Email!");
else
{
//....
}
?>
[/code]

I was just wondering if it was viable to use Regex to check for the URL they put in as I will not know any information about length etc language etc etc. I have a small function that strips off the "HTTP://" if its there,  I was just wondering if it was a viable option to check the rest??

[effigy]

Yes, there are many [url=http://www.google.com/search?hl=en&lr=&q=url+validation+regex&btnG=Search]out there[/url]. It all depends on how detailed you want to be, what kinds of URLs you want to accept (ftp, e.g.), and how well you understand the specification.

[paul2463]

thanks effigy, did somr searching and came up with this
[code]
<?php
function isValidDomain($domainName)
{
return ereg("^(http|https)://(www\.)?.+\.[a-z]{2,7}$", $domainName);
}
?>
[/code]
it will do what I want, i am just checking for typos inthe construct of the url and to make sure they dont just type rubbish in the box

[effigy]

I would use preg and change[tt] (http|https) [/tt]to[tt] (?:https?)[/tt]. Depending on where your data is coming from, you may want to use[tt] \z [/tt]instead of[tt] $[/tt].