Re: regular expression
- From: Krishna.Thotakura@xxxxxxxxxxxxxxxx (Krishna Thotakura)
- Date: Thu, 29 Dec 2005 13:30:44 -0600
Although, i read about negated versions of lookahead and lookbehind
operators, i didnt really understand how to use them. Now, i get it.
Thanks John.
"John W. Krahn" <krahnj@xxxxxxxxx>
12/29/2005 12:47 PM
To: Perl Beginners <beginners@xxxxxxxx>
cc:
Subject: Re: regular expression
Krishna.Thotakura@xxxxxxxxxxxxxxxx wrote:
> I am looking for help on a PERL regular expression that can do the
> following:
>
> 1. Make sure that the string is 20 chars or else match should fail.
> 2. The string can have word characters or spaces or comma(,),
hyphen(-),
> ampersand(&) characters.
> 3. If the string contains only spaces, then match should fail.
>
> Any ideas on how this can be done using just one regular expression ?
This may do what you want:
$ perl -le'
my @array = (
q/ /,
q/ab def,ghi-jkl&mn_pq/,
q/abcdefghi^jklmnopqrs/,
q/abcd/,
q/abcdefghijklmnopqrstuvwxyz/,
);
for ( @array ) {
print "\047$_\047 is ", /\A(?!\s{20})[\w\s,&-]{20}\z/ ? "" : "NOT ",
"valid";
}
'
' ' is NOT valid
'ab def,ghi-jkl&mn_pq' is valid
'abcdefghi^jklmnopqrs' is NOT valid
'abcd' is NOT valid
'abcdefghijklmnopqrstuvwxyz' is NOT valid
John
--
use Perl;
program
fulfillment
--
To unsubscribe, e-mail: beginners-unsubscribe@xxxxxxxx
For additional commands, e-mail: beginners-help@xxxxxxxx
<http://learn.perl.org/> <http://learn.perl.org/first-response>
*************************************************************************
This communication, including attachments, is
for the exclusive use of addressee and may contain proprietary,
confidential and/or privileged information. If you are not the intended
recipient, any use, copying, disclosure, dissemination or distribution is
strictly prohibited. If you are not the intended recipient, please notify
the sender immediately by return e-mail, delete this communication and
destroy all copies.
*************************************************************************
- Prev by Date: Re: graf-code
- Next by Date: using an system call for decryption
- Previous by thread: RE: regular expression
- Next by thread: Re: graf-code
- Index(es):
Relevant Pages
|
