Re: quick question about preg_replace

On Thu, 05 Oct 2006 09:29:46 +0800, Penthexquadium wrote: > On Wed, 4 Oct 2006 23:19:58 +0200, "Martin Bach Nielsen" > <phpmaillist@martinbn.info> wrote: > >> Hi all. >> >> >> >> I have written a guestbook (I know, there's a ton out there), which until >> recently did not get any spam, so now I'm trying to remove the spam-ad by >> using preg_replace: >> >> >> >> $melding = preg_replace('/(<a href=\" >>http:\/\/[^^]+)/i', "This message is >> temporarily cut-off due to spam-suspicion.", $melding); >> >> >> >> However, this only makes the problem half-solved, since I also want any text >> before the link to be replaced with a message as stated above. The above >> line removes anything after '<a href=//'. >> >> Is there any way to make the above line to include anything before the <a >> href=// ? >> >> >> >> I have tried different options, and yes, I have read the php manual on >> preg_replace, but I might not have properly identified how to get the text >> in front modified. >> >> >> >> Thankful for any hints, tips, links, anything that helps :-) >> >> >> >> Regards, >> >> Martin Bach Nielsen >> > > If you only want to replace the line including url(s) by a message, a > simple regular expression is enough. > > <?php > $melding = "This is a spam.\n" > . "This is a <a > href=\"http://www.example.com/\">example</a> > line.\n" > . "Another line.\n" > . "<a > href=\"http://www.e.com/ads/show?n=123\">123</a> > (456)\n" > . "End Line.\n"; > > $melding = preg_replace("/.*?<a > href=\"http:\/\/.+/i", "<This line is temporarily > cut-off due to spam-suspicion.>", $melding); > > echo $melding; > ?> > > The script above will output: > > This is a spam. > <This line is temporarily cut-off due to spam-suspicion.> > Another line. > <This line is temporarily cut-off due to spam-suspicion.> > End Line. If you use this code, be sure to use &lt; in stead of < and &gt; in stead of > or else the spam messages won't be shown. Otherwise, if you want the entire message changed, it's quicker to do: if (preg_match('/(<a href=\"http:\/\/[^^]+)/i', $melding)) { $melding = 'This message is temporarily cut-off due to spam-suspicion.'; } Just an idea... Ivo