Beefy Boxes and Bandwidth Generously Provided by pair Networks
Perl: the Markov chain saw

Re^2: match two elements from an array in a row

by Kanji (Parson)
on Aug 17, 2007 at 01:45 UTC ( #633200=note: print w/replies, xml ) Need Help??

in reply to Re: match two elements from an array in a row
in thread match two elements from an array in a row

Perhaps premature optimization, but I'd recommend switching your tests around so that you only look for matches of numbers you care about:-

if ($data[$i] =~ m/^(?:81|82)$/ && $data[$i] eq $data[$i+1]) {

(Note the addition of anchors in the regex so you don't accidentally match a pair of, say, 181s.)

And if the number of numbers you're trying to matches is likely to grow or change often, it may be easier using a hash instead of a regex:-

my %wanted = map { $_, 1 } qw( 81 82 ); # ... for my $i (0 .. ($#data - 1)) { if (exists $wanted{$data[$i]} && $data[$i] eq $data[$i+1]) {


Log In?

What's my password?
Create A New User
Node Status?
node history
Node Type: note [id://633200]
and all is quiet...

How do I use this? | Other CB clients
Other Users?
Others studying the Monastery: (7)
As of 2018-06-23 08:34 GMT
Find Nodes?
    Voting Booth?
    Should cpanminus be part of the standard Perl release?

    Results (125 votes). Check out past polls.