preg_replace/regular expression confusion

[clonetrooper9494]

I was working a script to replace urls in a forum post in to html using preg_replace. This is my first experience using regular expression, but I thought I had it when I got it to work on this editor: http://rejex.heroku.com/ with the regex string being "(http://[\S]+)" and source being "this is a site http://website.com/ go there". So I stuck that in preg_replace and thought I would be done after that, but it isn't working...

<?php$input = 'this is a test post. http://website.com/yeah.php <- go there please!';echo "before:<br>".$input."<br>after:<br>";$output = preg_replace('(http://[\S]+)','<a href="$1">$1</a>',$input);echo $output;?>

returns

before:this is a test post. http://website.com/yeah.php <- go there please!after:this is a test post. <- go there please!

the html is being hidden because the variables aren't working, or something. The source of the page shows the HTML but no URL..can any one help?

[End User]

One or more of these might be what you're looking for:Automatically make active links to URLs. Works for both 'http:' and 'mailto:' links.http://psoug.org/snippet/PHP-Auto-Link-Maker_20.htmAnd a supposedly more secure version:More secure version of the link conversion codehttp://psoug.org/snippet/Secure-Auto-Link-Maker_21.htmAnd this one, which looks kind of gruesome to me:http://psoug.org/snippet/Auto-Link-Maker-2_130.htm

[clonetrooper9494]

Those will work, thank you!but I am still curious on why my script didn't work, in case I have to use preg_ functions in the future...

[Ingolme]

It's probably using the parenthesis() as delimiters, so $1 wasn't being set.This possibly would have worked:preg_replace('#(http://[\S]+)#','<a href="$1">$1</a>',$input);