Perl Guru Forums: Perl Programming Help: Regular Expressions: Nicer way to do this?

CGI/Perl Guide | Learning Center | Forums | Advertise | Login

Site Search: in


	MAIN INDEX	SEARCH POSTS	WHO'S ONLINE	LOG IN

Home: Perl Programming Help: Regular Expressions:
Nicer way to do this?

kencl
User

Oct 9, 2003, 4:35 AM

Post #1 of 3 (2547 views)

Nicer way to do this?	Can't Post

Hi Folks,

Took me a while to realize that the pattern was gobbling up the trailing single pipe, but here's what I came up with. Does anyone see a "neater" way of doing this, or would you consider this a good solution?

Code

my $list = 'one|two|three|four'; 
my %changes = (one => 1, three => 3); 
 
$list =~ s/\|/\|\|/g;  # double up pipes 
$list =~ s/((^|\|)(.*?)(\||$))/ exists($changes{$3}) ? $2 . $changes{$3} . $4 : $1/ge; 
$list =~ s/\|\|/\|/g;  # single up pipes 
 
print $list;  # produces 1|two|3|four

Thanks!

>> If you can't control it, improve it, correlate it or disseminate it with PERL, it doesn't exist!

KevinR
Veteran

Oct 9, 2003, 8:56 PM

Post #2 of 3 (2542 views)

Re: [kencl] Nicer way to do this? [In reply to]	Can't Post

another way to accomplish the same thing:

Code

my $list = 'one|two|three|four'; 
my %changes = (one => 1, three => 3); 
 
foreach (keys %changes) { 
$list =~ s/$_/$changes{$_}/g; 
} 
print $list;

-------------------------------------------------

(This post was edited by KevinR on Oct 9, 2003, 8:57 PM)

kencl
User

Feb 25, 2004, 1:14 PM

Post #3 of 3 (2467 views)

Re: [kencl] Nicer way to do this? [In reply to]	Can't Post

Sometimes the solution is so obvious in hindsight. Figured I'd post it for the benefit of others.

Code

 $list =~ s/([^|]+)/exists($changes{$1}) ? $changes{$1} : $1/ge;

>> If you can't control it, improve it, correlate it or disseminate it with PERL, it doesn't exist!

(This post was edited by kencl on Feb 25, 2004, 1:15 PM)

Search for (options)

Web Applications & Managed Hosting Powered by Gossamer Threads
Visit our Mailing List Archives