CODEWITHSUNDEEP
perlhash
Steve0320
Steve0320

Reputation: 23

In hash, what does values in a square brackets means? language is Perl

Source code:

$Bo2l = 'TGYTCM';

%amb = ( Y => "[CT]", M => "[TG]", D => "[AGT]", N => "[AGCT]");

foreach $key_amb(keys%amb){ 
    $Bo2l =~ s/$key_amb/$amb{$key_amb}/g;   
}
$sequence = 'AAAAAATGATTGCTCATTTGCTCTGCTCGCAAAAAAAAATGATTATTTTTT';

for($i=0; $i<length($sequence)-5; $i++){
    $cutseq = substr($sequence, $i, 6);
    if($cutseq =~ m/$Bo2l/){
        $pos = $i+1;
        print "Bo2l\t$pos\t$cutseq\n";
    }
}

I can understand the $sequence, but I can't understand what those square brackets do.

Upvotes: 0

Views: 276

Answers (1)

Josh Greifer
Josh Greifer

Reputation: 3231

The square brackets are "character class" delimiters. so "[CT]" means "match either a C or a T".

Upvotes: 1

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