Hi,
I had a little play and noticed that your IsNumber() sub returns true for integers with embedded (and/or trailing) garbage, unless the garbage is alphabetic or whitespace.
Seemed odd ... but, of course, FAIK it's quite possible that the integer inputs you're receiving are either guaranteed to have no such garbage or are to be deemed acceptable if they include such garbage.
For the input array in the following script (where I also compare the IsNumber() and looks_like_number() results), IsNumber returns "1" for all but the final input.
use strict;
use warnings;
use Scalar::Util qw(looks_like_number);
use Test::More;
my @in = ('99/999998', '9999*9998', '9999-9998', '9999+9998',
'9999:9998', '9999@:%?', '9999@:%?9998', '9999ABCD9998',);
for(@in) {
cmp_ok(IsNumber($_), '==', looks_like_number($_), "$_: " . IsNumber
+($_));
}
done_testing();
sub IsNumber {
my ($string) = @_;
my $valid = 0;
my $count = $string =~ tr/\.//;
if ( $string =~ m/[a-zA-Z\ \[\]]/ )
{
$valid = 0;
}
elsif ( $string =~ /[^\x00-\x7F]/ )
{
$valid = 0;
}
elsif ( $count > 1 )
{
$valid = 0;
}
elsif ( $string =~ m/[#@':;><,.{}[]=!"£$%^&*()]/ )
{
$valid = 0;
}
elsif ( $string =~ m/^[+-]?\d+$/ )
{
$valid = 1;
}
elsif ( $string =~ m/^[+-]?[0-9]+[.]?[0-9]+/ )
{
$valid = 1;
}
return $valid;
}
Outputs:
not ok 1 - 99/999998: 1
# Failed test '99/999998: 1'
# at try.pl line 13.
# got: 1
# expected:
not ok 2 - 9999*9998: 1
# Failed test '9999*9998: 1'
# at try.pl line 13.
# got: 1
# expected:
not ok 3 - 9999-9998: 1
# Failed test '9999-9998: 1'
# at try.pl line 13.
# got: 1
# expected:
not ok 4 - 9999+9998: 1
# Failed test '9999+9998: 1'
# at try.pl line 13.
# got: 1
# expected:
not ok 5 - 9999:9998: 1
# Failed test '9999:9998: 1'
# at try.pl line 13.
# got: 1
# expected:
not ok 6 - 9999@:%?: 1
# Failed test '9999@:%?: 1'
# at try.pl line 13.
# got: 1
# expected:
not ok 7 - 9999@:%?9998: 1
# Failed test '9999@:%?9998: 1'
# at try.pl line 13.
# got: 1
# expected:
ok 8 - 9999ABCD9998: 0
1..8
# Looks like you failed 7 tests of 8.
Cheers,
Rob
PS
I also did not expect that
IsNumber('1.123e4') would return 0. But again, I don't know much about the possible inputs or the criteria for assessing them.
-
Are you posting in the right place? Check out Where do I post X? to know for sure.
-
Posts may use any of the Perl Monks Approved HTML tags. Currently these include the following:
<code> <a> <b> <big>
<blockquote> <br /> <dd>
<dl> <dt> <em> <font>
<h1> <h2> <h3> <h4>
<h5> <h6> <hr /> <i>
<li> <nbsp> <ol> <p>
<small> <strike> <strong>
<sub> <sup> <table>
<td> <th> <tr> <tt>
<u> <ul>
-
Snippets of code should be wrapped in
<code> tags not
<pre> tags. In fact, <pre>
tags should generally be avoided. If they must
be used, extreme care should be
taken to ensure that their contents do not
have long lines (<70 chars), in order to prevent
horizontal scrolling (and possible janitor
intervention).
-
Want more info? How to link
or How to display code and escape characters
are good places to start.