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Perl code to differentiate numeric and non-numeric input

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Top Forums Shell Programming and Scripting Perl code to differentiate numeric and non-numeric input
# 8  
Old 03-05-2007
if you don't want to consider --45 as numeric:
Code:
if ( $input =~ /^[\+-]?[0-9]*\.*[0-9]*$/ && $input !~ /^[\. ]*$/ ) {

and 56..34 doesn't seem to be numeric, so how about:
Code:
if ( $input =~ /^[\+-]?[0-9]*\.?[0-9]*$/ && $input !~ /^[\. ]*$/ ) {

# 9  
Old 03-05-2007
Quote:
Originally Posted by anbu23
[CODE#!/usr/bin/perl

print "Enter a term: ";
$Input = <STDIN>;
print "\n";

if ( $Input =~ /^[\+-]*[0-9]*\.*[0-9]*$/ && $input !~ /^[\. ]*$/ ) {
print "$Input is numeric\n";
}
else {
print "$Input is non-numeric\n";
}
[/CODE]
Hi Anbu,
I tried your code but it's not working.

$ cat xxx.pl
#!/usr/bin/perl

print "Enter a term: ";
$Input = <STDIN>;

if ($input =~ /^[\+-]*[0-9]*\.*[0-9]*$/ && $input !~ /^[\. ]*$/) {
print "$Input is numeric\n";
}
else {
print "$Input is non-numeric\n";
}
$ perl xxx.pl
Enter a term: 10
10
is non-numeric
$ perl xxx.pl
Enter a term: 23
23
is non-numeric
# 10  
Old 03-05-2007
Code:
$Input = <STDIN>;

if ($input =~ /^[\+-]*[0-9]*\.*[0-9]*$/ && $input !~ /^[\. ]*$/) {

Variable names are case sensitive and also incorporate the Yogesh Sawants comments.

Code:
$input = <STDIN>;

if ( $input =~ /^[\+-]?[0-9]*\.?[0-9]*$/ && $input !~ /^[\. ]*$/ ) {

# 11  
Old 03-05-2007
Hi Anbu,

Thanks for the guidance. it works fine now!
# 12  
Old 08-04-2007
Question One small doubt
How to invoke the above perl code in ksh script.

Thanks in adv.

Br//
Vijay
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