I have a bunch of file names in the array called "@array". I want to pull out those files that start with "KL" and then either 1 or 2 digits and then an underscore, and I want to push those files onto the array called "@files". This is how I tried to do this: 
foreach $file (@array) {
    if ($file =~ /^KL\d{1|2}_/) {
        push (@files, $file);
        print "$file\n";
    }
}

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This doesn't work. However, the following works, but only because all the files in "@array" have either 1 or 2 digits following the initial "KL". If there had been a file name in @array like "KL123_rest.txt" that I didn't want to push onto the array "@files", then my code wouldn't have worked. 
foreach $file (@array) {
    if ($file =~ /^KL\d+_/) {
        push (@files, $file);
        print "$file\n";
    }
}

[download]
How do I correctly quantify \d in this situation? Thanks. Eric

In reply to quantifiers with digits (\d{1|2} doesn't do what I expect) by efoss

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