RE: [squid-users] Confusion regarding regex

Hi Amos,
 
There is still some confusion regarding regex and any help will be great please.
 
 
you told that squid uses posix regex but is it BRE or ERE???
 
as for ERE according to my best understanding special characters are not required to be escaped and if escaped then will lose there special meaning and on the contrary in BRE some special characters like ( ) must be escaped otherwise they will be treated as literals.
 
 
If the regex processor is built on the squid itself or it is using the os default regex parser?
 
 
thanking you &
 
 
regards,
 
Bilal
 

----------------------------------------
> Date: Wed, 16 Jun 2010 23:11:08 +1200
> From: squid3_at_treenet.co.nz
> To: squid-users_at_squid-cache.org
> Subject: Re: [squid-users] Confusion regarding regex
>
> GIGO . wrote:
>> Hi,
>>
>> Please need your guidance regarding the regex used by squid. Is it bre ere or perl? I assume that squid using a gnurep compatible version? Am i right?
>>
>
> POSIX regular expressions.
>
>>
>> In grep to use some metacharacter we have to encode it which are ‘\?’, ‘\+’, ‘\{’, ‘\|’, ‘\(’, and ‘\)’ does this hold true to write regex for squid as well?
>>
>
> Yes. I know for at least these: \. \? \+ \( \)
> Not sure about the others.
>
>> acl MP3url urlpath_regex \.mp3(\?.*)?$ isnt this expression should be written as \.mp3'\(''\?'.*'\)''\?'$
>
> No. It means the text ".mp3" ending the path (aka the MP3 file
> extension), with optional query string parameters following.
>
> Which matches URI standard syntax:
> protocol ':' '/' '/' domain '/' path '?' parameters
>
>
> Amos
> --
> Please be using
> Current Stable Squid 2.7.STABLE9 or 3.1.4
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Received on Mon Jun 21 2010 - 06:25:50 MDT