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Newbie needs help please :)

Could somebody direct to a thread or a link that explains

PHP:

<?php

$homepage = trim($homepage1);
    if ($homepage) 
    {
        if (preg_match('#^www\.#si', $homepage)) 
        {
            $homepage = "http://$homepage";
        } 
        else if (!preg_match('#^[a-z0-9]+://#si', $homepage)) 
        {
            // homepage doesn't match the [url]http://-style[/url] format in the beginning -- possible attempted exploit
            $homepage = '';
            }
    }

?>

just the "preg_match" etc and the values inside the ('Stuff in, here') please?

thanks

btw, this a homepage verification script

The si at the end means that it's case-insensitive and new lines are matched if a dot is written (for this script, you don't really need the s).

The ^ means NOT, so, ^www means: NOT 'www'. The dot matches any character.

^[a-z0-9]+ means NOT a letter or number repeating at least once (the repeating things is the plus). The :// is just a string, like www in the 1st example.

In any case, I don't think this script would actually work. But if it does, more power to you.

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well how would it check a urls info ? using this script can u explain ?

PHP:

<form>
<input type='text' name='formhtml' size='40'>
<br>
<br>
<input type='submit' value='submit' name='submit'>
</form>
<?
$submit = $_POST['submit'];
$userwebsite = $_POST['formhtml'];
if (isset($submit))//In here it checks the name they entered and checks to see if its [url]http://[/url]$userwebsite
{
    echo "Click Here For Site: <a href='$userwebsite'>$userwebsite</a>";
}
else //this would be displayed if the website didnt match [url]http://www.[/url]$userwebsite
{
    echo "learn how to type!";
}
?> 

PHP:

<?php

if (preg_match("/http\:\\/\\//i", $string))
{
   echo 'Valid URL';
}
else
{
   echo 'Invalid URL';
}

?>

You can the <a tag yourself, as it would be inefficient to check with the <a tag.

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Last edited by Ynhockey, November 14th, 2004 07:29 AM (Edited 1 times)

why do you have the /http:\/\//i instead of just http://i ?

Quote:

Originally posted by Ynhockey
The si at the end means that it's case-insensitive and new lines are matched if a dot is written (for this script, you don't really need the s).

The ^ means NOT, so, ^www means: NOT 'www'. The dot matches any character.

^[a-z0-9]+ means NOT a letter or number repeating at least once (the repeating things is the plus). The :// is just a string, like www in the 1st example.

In any case, I don't think this script would actually work. But if it does, more power to you.

The caret (^) means 'starting with', not 'not'.

Sorry, my bad, I forgot. ^ is NOT inside square brackets (again, plz correct me if I'm wrong).

But in any case, the code I posted on the last post should work.

Quote:

why do you have the /http:\/\//i instead of just http://i ?

Because the forward slash is a special character in regex and needs to be escaped (with a backward slash). This also applies to dots, greater/less than signs, etc.

Btw, a slight correction to my code:
change: "/http to: "/\bhttp

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Last edited by Ynhockey, November 14th, 2004 08:46 AM (Edited 1 times)

bah, were did you guys learn all this link me

Google for regular expressions.