I'm guessing it's to do with the fact that 'lama' has two a's? Is it possible to easily amend this code to handle this case?
Yes, and it's a trivial amendment. Just deploy the /g modifier:
#!/usr/bin/perl
use strict;
use warnings;
my @words = <DATA>;
chomp @words;
while ( @words >= 2 ) {
my $model = my $regex = shift @words;
if ( $regex =~ s/(.*?)[ab](.*?)/$1\[ab\]$2/g ) {
my @hits = grep /^$regex$/, @words;
if ( @hits ) {
print join( " ", $model, "matches", @hits, "using", $regex
+, "\n" );
}
}
}
__DATA__
lama
lamb
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