This is a great technique, thanks, Scott.
But, I'm putting this into the Do Not Crawl front end of a google search appliance and it has to be done with gnu regexp. So I've been working on it and I got something like this for starters:
^http://www\\.example\\.com/events/events\\?\.size=[\d|\d\d^10]\.
Where with the above I am intending to match my domain, then the directory path events/events followed by a questin mark, then any characters leading up to size = any one or two digits but not 10 followed by any characters.
That is where I need to be going.
Peter
-------- Original Message --------
Subject: Re: [nyphp-talk] REGEXP Solution Needed
From: Scott Mattocks <sc...@crisscott.com>
Date: Wed, September 08, 2010 6:19 am
To: NYPHP Talk <talk@lists.nyphp.org>
On 09/08/2010 08:30 AM, p...@blu-studio.com wrote:
> Using GNU Regular Expressions I need to examine an URL like those below,
> checking the size key and value, I need to capture and block all URLs
> where 'size does not equal 10'. In other words "size=12", not
> acceptable.
Regular expressions are expensive and should only be used when
absolutely necessary. If you are checking for a specific string, just
check for it with str* functions. Here's how I would check for it:
$key = 'size';
$val = 10;
$url = '';
$last = strrpos($url, $key . '=');
if ($last !== false && $last == strrpos($url, $key . '=' . $value))
{
echo 'Good';
}
else
{
echo 'Bad';
}
That block of code makes sure that 'size=' shows up in your URL and that
the last occurrence of 'size=' is actually 'size=10'. The last
occurrence is the value that will be passed to the server so that's
probably the only one you care about. If you want to verify that there
is only one occurrence use strpos(...) == strrpos(...) in addition to
the checks above.
--
Scott Mattocks
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