Validate url with array paramter in php?

Question

I am trying to add preg_match validation for a URL like:

http://test.com/page/?param1[0=a&param2[1]=b

If you see in above example one square bracket is missing.

Answer 1

Checking with two regex, may this works for you

$website = 'http://test.com/page/?param1[0=a&param2[1]=b';

if (!preg_match("/\b(?:(?:https?|ftp):\/\/|www\.)[-a-z0-9+&@#\/%?=~_|!:,.;]*[-a-z0-9+&@#\/%=~_|]/i",$website) || !preg_match("/^[^\[\]]*+(\[(?>[^\[\]]|(?1))*+\][^\[\]]*+)*$/",$website)) {
    echo "Invalid URL"; 
}else{
    echo 'valid';
}

O/p: Invalid URL

The only problem with this check is It only check bracket unbalance, not its position.