eregi_replace; recognize hyperlinks automatically

[jonas-e]

Been busy with other things - I haven't tried out all of your options above - some of them created problems. I figured out this method which works fairly well:

$text = "
Here is a text - www.ellehauge.net - it has some links with e.g. comma, www.one.com, in them.
Some links look like this: http://mail.google.com - mostly they end with a space or 
carriage return www.unis.no
<br /> - but they may also end with a period: http://ellehauge.net. You may even put 
the links in brackets (www.skred-svalbard.no) (http://one.com).
From time to time, links use a secure protocol like https://gmail.com - tricky, isn't it?
";

echo '<p>'.$text.'<br />&nbsp;<br /></p>';

// anything which starts with "http" and has URL chars
$text = eregi_replace(
  'http([-_./a-z0-9!&%#?+,\'=:;@~]+)',
  '<a href="http\\1" rel="ext">http\\1</a>', $text);
// anything which starts with "www." and has URL chars
$text = eregi_replace(
  'www.([-_./a-z0-9!&%#?+,\'=:;@~]+)',
  '<a href="http://www.\\1" rel="ext">www.\\1</a>', $text);
// remove "," from the end of hrefs
$text=str_replace('," rel="ext">','" rel="ext">',$text);
// remove "." from the end of hrefs
$text=str_replace('." rel="ext">','" rel="ext">',$text);

echo '<p>'.$text.'</p>'; 

- except that I still get hyperlinks where the "," and "." still APPEAR within the link - although it has been removed from the link itself. I.e. technically it works - but it doesn't look great. Any ideas how to get the comma/period out of the text?

I might try out some of your solutions above if they proved to work?

NB: Ignore the <<rel="ext">> - it has something to do with some javascripting to avoid using the depricated "target:_blank" ...

[jonas-e]

Yo - I seem to have found a way which is nearly fool proof:

$text = "
Here is a text - www.ellehauge.net - it has some links with e.g. comma, www.one.com, 
in it. Some links look like this: http://mail.google.com - mostly they end with a 
space or carriage return www.unis.no
<br /> - but they may also end with a period: http://ellehauge.net. You may even put 
the links in brackets (www.skred-svalbard.no) (http://one.com).
From time to time, links use a secure protocol like https://gmail.com |
This.one.is.a.trick. Sub-domaines: http://test.ellehauge.net | 
www.test.ellehauge.net | Files: www.unis.no/photo.jpg | 
Vars: www.unis.no?one=1&amp;~two=2 | No.: www.unis2_check.no/doc_under_score.php |
www3.one.com | another tricky one:
http://ellehauge.net/cv_by_id.php?id%5B%5D=105&amp;id%5B%5D=6&amp;id%5B%5D=100.<br />
Here is my [link=blog.php]blog&raquo;[endlink] <br />
This one contains http AND www: http://www.unis.no
";
echo '<p style="text-align:left;">'.$text.'</p></div>';

function hyper($text) {
    // replace those starting with http(s)
    $text = preg_replace(
        '~((https?)(://[-/a-zA-Z0-9_\?=&;:#%!@\~]+)(\.[-/a-zA-Z0-9_\?=&;:#%!@\~]+){1,})~',
        '<a href="\1" rel="ext">\1</a>', $text);
    // replace those starting with www (but NOT http://www!)
    $text = preg_replace(
        '~(\s|\()((www[0-9]?)(\.[-/a-zA-Z0-9_\?=&;:#%!@\~]+){1,})~',
        '\1<a href="http://\2" rel="ext">\2</a>', $text);
    // links within the same site
    $text = eregi_replace(
        '\\[link=([-_./a-zA-Z0-9!&%#?+,\'=:;@~]+)]([^\\[]+)\\[endlink]',
        '<a href="\\1">\\2</a>', $text); // internal links - NOT http or www!
    return $text;
}

$content=hyper($text);
echo '<p>'.$content.'</p>'; 

There might still be some falts in it - let me know if you find any ...

[blm126]

All the regular expressions above seem to forget that a site doesn't have to have www in it. I could setup an addresss to be something like https://myforums.sweetsite.co.uk . That address is perfectly valid. I threw the following expression together real quick.

<?php
$test = "
www.ebay.com
www.somesite.com
somesite.co.uk
http://thiis9cool.nr
https://www2.coolhuh.com. Interesting Huh?
";
$test_with_links = preg_replace("/(http(s?):\/\/)?([a-zA-Z0-9\.]+\.[a-zA-Z]{2,3})/",'<a href="http$2://$3">http$2://$3</a>',$test);
?>

I included my test text, just to show what it should handle.

[jonas-e]

Hi blm126
I just tested my function on your example https://myforums.sweetsite.co.uk - it works fine - due to the {1,} part.

(://[-/a-zA-Z0-9_\?=&;:#%!@\~]+)

- defines the first part after the http(s) starting with "://"

(\.[-/a-zA-Z0-9_\?=&;:#%!@\~]+){1,}

- let's you have as many ".***" elements as you like after that.

(\s|\()

- in front of "((www[0-9]?)" prevents expressions like "http(s)://www.**" from being processed twice - otherwise giving odd results ...

[james438]

I hope I am not repeating what Jonas-e just said, but is there a way to modify the code to incorporate

echo preg_replace("#(<a\s[^>]+>http://\S+</a>)|(<[^>]+http://[^>]+>)|http://\S+#ie",'"$0"=="$1" || "$0"=="$2" ? "$0" : "<a href=\"$0\">$0</a>"',$text);

into blm126's expression?

I have been away from coding for a bit, but the above code will hyperlink urls and ignore the ones that are used for image src and ones that are already hyperlinked. It does not hyperlink ones that do not have the http:// prefix however, but then again that might be a good thing too. I found this example at http://www.tote-taste.de/X-Project/regex/eval.html.

[taylornolen]

I have a question about this...

I tried to figure it out but there doesn't seem to be any documentation I could find within the last hour pertaining to this.

I have an internal script that takes user input which can include internal network URLs to a share on the network like "\\fileserver\file\spreadsheet.xls". I cannot for the life of me figure out how to write the preg_replace parameters to get it to find the link then replace with the appropriate hyperlink tag. Has anyone done this? Can it be done? I always end up stripping the leading \.