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Re: I don't understand.

by davido (Cardinal)
on Nov 19, 2004 at 01:00 UTC ( [id://408923]=note: print w/replies, xml ) Need Help??


in reply to I don't understand.
in thread Detecting if a scalar has a number or string

Well, your regexp won't properly identify:

1.5
-3
-2.89
.32
0.5
-.01

[download]

...as numbers. It will also fail to reject empty strings.


Dave

Replies are listed 'Best First'.
Re^2: I don't understand.
by Anonymous Monk on Nov 05, 2008 at 16:07 UTC
    Ok, here's a bit of enhancement: 
    foreach $abc ("asd","","0","123","-12","1.2","-1.2","12-","-a12","a1")
{print "$abc:", is_a_num($abc) ? "Number" : "NaN", "\n";}

sub is_a_num {
   return ($_[0] =~ /^(\+|-)?([0-9]|\.)+$/) || 0 ;
}

    [download]
    Thierry
[reply]
[d/l]

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