In your match try to use the special regexp anchors ^ and $:
if ($input =~ /^[0-9]$/) {
print "input was a single digit number\n";
} else {
print "input wasn't a single digit number\n";
}
From the Perl regular expression tutorial ( perlre), the "^" and "$" are defined as:
^ Match the beginning of the line
$ Match the end of the line (or before newline at the end)
Unless they are used, Perl will look for a match anywhere within your $input string! ;-)
Update: threw in some perldoc definitions for your viewing pleasure :)
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