[prev in list] [next in list] [prev in thread] [next in thread] 

List:       exim-users
Subject:    Re: [exim] Regexps (was: ACL filtering)
From:       Always Learning <exim.users () exim1 ! euro2 ! net>
Date:       2010-04-24 13:57:44
Message-ID: 2010-04-24.14-58-00.358248F6 () relay
[Download RAW message or body]


Eduardo M KALINOWSKI wrote on Sat, 24 Apr 2010 10:19:58 -0300.

> On 04/23/2010 09:11 PM, Always Learning wrote:

>> [a](1) = match only one 'a'

> No, that would match an 'a', followed by a '1', storing the 1 in a 
> matched group. To specify the number of matches one uses curly braces: 
> {1}. However, it is redundant to specify {1}: if you want exactly one 
> match, just specify what you want matched. "[a]{1}" and "[a]" are the same.
>
> Furthermore, [...] means one of the characters inside the brackets: 
> "[ab]" is either a or b. If there is only one character, there is no 
> need for brackes: just specify them.
> 
> In short, to match one 'a', use "a".

Thank you for explaning the {1}.

>> [-_.](?) = match next character which should be one or nil occurrences
>> of .-_

> To match zero or one of an expression, use "?", not "(?)" (which is 
> seems like an illegal regexp - I wonder how it gets parsed). And I 
> believe you meant one or nil of one of the characters .-_

Would one use [-_.]{?}, being similar to [a]{2}, rather than only [-_.]?
or is '?' a special character in RegExp ?

> While to geared towards exim, these tutorials are quite useful:
> http://perldoc.perl.org/perlrequick.html
> http://perldoc.perl.org/perlretut.html
> 
> Or google "regexp tutorial", there's bound to be dozens of useful resources.

I'll read them as soon as I can. Thank you for the URLs.

Regards,

Paul.

-- 



-- 
## List details at http://lists.exim.org/mailman/listinfo/exim-users 
## Exim details at http://www.exim.org/
## Please use the Wiki with this list - http://wiki.exim.org/
[prev in list] [next in list] [prev in thread] [next in thread]