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my $CPU = 'Intel(R) Xeon(R) CPU          X5660  2.80GHz ';
# field:    0        1       2  3..11     12  13 14       # using / /
# field:    0        1       2            3      4        # using / +/

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my @CPU_SPLIT = split / +/, 'Intel(R) Xeon(R) CPU          X5660  2.80
+GHz ';

...

# 3 - feed the whole array
print join ' ', @CPU_SPLIT; print "\n";