Is there a particular reason this need to be done all at once? Assuming you have a good reason for not using one of the many CSV-parsing modules (e.g. Text::CSV), it would be a lot clearer to do something like:

if ($string =~ m/Total requests:/) {
    @array = split /,/, $string;
}
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rather than trying to do a match and capture at the same time. If you have your heart on capturing things in a regular expression, you could do

if ($string =~ m/Total requests:/) {
    @array = $string =~ /(\d+)/g;
}
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But I'm willing to bet that your life would be easier with just a CSV-parsing module.

Incidentally, your suggestion of (\d)+ will not work because you will repeatedly overwrite your result and hence will only get the last match (60 in your example).