I don't think you nedd a nasty regex:
use warnings;
use strict;
use Scalar::Util qw(looks_like_number);
while (<DATA>) {
chomp;
my $temp = $_;
my $unit = lc chop $temp;
if (looks_like_number($temp)) {
print "temp = $temp : unit = $unit\n";
}
}
__DATA__
55F
77c
foo
+0.4F
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