[ILUG] Regular Expressions

[Robert Sweetnam]

Pádraig Brady wrote:
>
> ^ anchors the string to the start.
> So in the example below you don't want that.
>   
That's what I thought. But it does apply to the explicit agents I wish 
to block i.e larbin, LibWWW, Jakarta etc. So no problem there.
>> Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; ru) Opera 8.50
>>     
>
> You can't really "AND" multiple things in the same RE
> so in .htaccess for example you specify each separately to match
> and the "AND" is implicit (unless you specify [OR]).
>
> If it's always in the same order then you could do:
> MSIE 6\.0.*ru.*Opera
>
>   
It's rarely in the same order but I was thinking as much. From what I 
have gathered regex on Squid uses the same syntax as egrep. It also 
supports PCRE so would that make a difference?
>> Any suggestions would be greatly appreciated.
>>     
>
> www.txt2re.com may be helpful?
> though I haven't used it in earnest.
>
>   
I've been there and tried that. My mathematical ability is completely 
shocking to the point of non-existent so I'm sad to say, and I had major 
problems trying to comprehend what I was presented with.

Nonetheless, thank for the suggestions. I will try to forge head with 
the htaccess solution. Using the forward-for directive in squid 
neccissated a custom log format for the backend servers which seems to 
interfere with the htaccess directives but I have an understanding of 
that so I know where to start

Thanks Pádraig.

Robert