Add http:// to the beginning of submitted url

I am looking the best way to add http:// to a submitted url. I have a site that allows users to submit their website url when signing up, the problem is some use开发者_开发问答r type "example.com" some users type "www.example.com" and some type "http(s)://example.com"

What I would like to accomplish is to make sure the end result is "http(s)://example.com" regardless of what they submit.

Is there any way to do this and still account for other things like co.uk or https?

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You don't really need of REGEX. REGEX are often a lot expensive. Here's a home made function that achieve your goal:

function fix_url($url) {
    return (substr($url, 0, 7) == 'http://' || substr($url, 0, 8) == 'https://')
        ? $url 
        : 'http://'.$url;
}

Samples:

$url = 'example.com';
$url1 = 'httpexample.com';
$url2 = 'http://example.com';
$url3 = 'https://example.com';

echo fix_url($url);
echo '<br>';
echo fix_url($url1);
echo '<br>';
echo fix_url($url2);
echo '<br>';
echo fix_url($url3);
echo '<br>';

Output:

http://example.com
http://httpexample.com
http://example.com
https://example.com

If you have any doubt, please consider adding a comment below.

References:

• substr()

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To account for http(s)://, this is very straight forward since there are two options only to check. i.e. check that the link starts with "http://" or "https://", if not then add "http://".

The other part of your question which is to account for ".co.uk", you can either gather all available suffixes in a dictionary which is a very bad idea or you can simply check for the presence of a "." leaving what comes after the "." to the user's responsibility.

I hope I answered your question :)

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for php,

$str = preg_replace('/(?m)^(?!https?:\/\/.+)(\S+)/',"http://$1",$str);

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Easy way to fix your URL :)

function addHttp( $url )
{
    if ( !preg_match("~^(?:f|ht)tps?://~i", $url) )
    {
        $url = "http://" . $url;
    }

    return $url;
}

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Search for 'http' and 'https' in the submitted URL, if search returned null add 'http' to the beginning. With Javascript: var mystring="example.com"; var normal=-1; var secured=-1; normal=mystring.search(/http/i); secured=mystring.search(/https/i); and so on