I would like to extract words of three letters from a string, for example:

ABCDEF would give (ABC), (BCD),(CDE), (DEF)

I would like to try to use pattern matching for this, so I have tried this: 
sub build_dictionnary{
    my $line="ABCDE";
    my @dic;

    $line=~s/(([A-Z]{1})[A-Z]{2})/push(@dic,$1);/g;
    
}

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So what I am trying to do here is to capture the 3 letters, save it in the dictionary array and then substitute the first letter by nothing (i.e remove it). This solution doesn't work, is it possible to do it that way?

Thank you!

In reply to substitution in regular expression by aeqr

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