Perl Guru Forums: Perl Programming Help: Regular Expressions: Find string of single digits in string of numbers

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:
Find string of single digits in string of numbers

gobbluth529
New User

Jan 15, 2010, 10:07 PM

Post #1 of 3 (6388 views)

Find string of single digits in string of numbers	Can't Post

I have several line of numbers for which I need to extract the single digits. All numbers are separated by spaces. Example:
28 5 29 29 5 5 27 30 5 29 34 34 34 33 29 5 30 34 34 34 33 34 34 34 34 33 34 33 34 34 34 30 26 33 34 33 26 32 33 33 33 33 34 33 33 34 33 26 33 33 33 33 32 31 34 32 33 32 5 4 7 8 3 6 8 4 33 31 33 33 27 33 30 5 30 32 26 4
As you can see there is a set of single digits nested within the string 5 4 7 8 3 6 8 4. these numbers will change and it does not matter what the numbers are as long as they are single digits. I can match that by doing
m/\s\d\s\d\s\d\s\d\s\d\s\d\s\d\s\d/
But the number of single digits that are strung together will also change, and I would like to specify that as a variable.
I want to do something like this:
m/<\s\d\s>{$t,}/
but that of course won't work. I want to be able to change $t to various numbers without changing the script. Any help with this would be greatly appreciated. I do not think using the word boundaries will work because they are digits and

Thanks.

FishMonger
Veteran / Moderator

Jan 16, 2010, 6:00 AM

Post #2 of 3 (6380 views)

Re: [gobbluth529] Find string of single digits in string of numbers [In reply to]	Can't Post

Code

use Data::Dumper; 
 
my $str = '28 5 29 29 5 5 27 30 5 29 34 34 34 33 29 5 30 34 34 34 33 34 34 34 34 33 34 33 34 34 34 30 26 33 34 33 26 32 33 33 33 33 34 33 33 34 33 26 33 33 33 33 32 31 34 32 33 32 5 4 7 8 3 6 8 4 33 31 33 33 27 33 30 5 30 32 26 4'; 
my @num = $str =~ /\b(\d)\b/g; 
print Dumper \@num;

Outputs:

Code

shawnhcorey
Enthusiast

Jan 16, 2010, 6:03 AM

Post #3 of 3 (6379 views)

Re: [gobbluth529] Find string of single digits in string of numbers [In reply to]	Can't Post

Code

m{ \b \d \s* $t \b }msx;

See `perldoc perlre`

__END__

I love Perl; it's the only language where you can bless your thingy.

Perl documentation is available at perldoc.perl.org. The list of standard modules and pragmatics is available in perlmodlib.

Get Markup Help. Please note the markup tag of "code".

Search for (options)

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