Beefy Boxes and Bandwidth Generously Provided by pair Networks
Keep It Simple, Stupid
 
PerlMonks  

Re^2: =~ matches non-existent symbols

by ikegami (Patriarch)
on Nov 18, 2014 at 17:38 UTC ( [id://1107606]=note: print w/replies, xml ) Need Help??


in reply to Re: =~ matches non-existent symbols
in thread =~ matches non-existent symbols

What a waste. This will slow down the program by so much and it'll use up so much more memory than needed. You could simply use 
use strict;
use warnings;

my $bad = 0;
while (<>) {
   if (!/^[actg]+$/i) {
      ++$bad;
      last;
   }
}

print $bad ? "BAD\n" : "OK\n";

[download]

Replies are listed 'Best First'.
Re^3: =~ matches non-existent symbols
by rnewsham (Curate) on Nov 18, 2014 at 22:34 UTC

    You are correct, I had not considered how inefficent that method is. Thanks for pointing it out.

[reply]

In Section Seekers of Perl Wisdom

Log In?
Username:
Password:

What's my password?
Create A New User
Domain Nodelet?

www.com | www.net | www.org
Node Status?
node history
Node Type: note [id://1107606]
help
Chatterbox?
and the web crawler heard nothing...

How do I use this? • Last hour • Other CB clients
Other Users?
Others making s'mores by the fire in the courtyard of the Monastery: (6)
As of 2024-04-19 13:15 GMT
Sections?
Information?
Find Nodes?
Leftovers?
    Voting Booth?

    No recent polls found