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my $good_chars = $FORM{'phone'} =~ tr/-()0-9. //;
$good_chars += 3 if $FORM{'phone'} =~ /ext/i;
...
   # Bad phone number!
   ...
}

my $good_chars = $FORM{'phone'}) =~ tr/-()0-9. //;
$good_chars += 3 if $FORM{'phone'} =~ /ext/i;
...
   # Bad phone number!
   ...
}