On Wed, 26 Feb 2003 16:30:56 -0800, [EMAIL PROTECTED] (T. Murlidharan Nair)
wrote:
>I have a cgi that need to accept only numeric values. ie +ve or -ve
>real numbers.
>Is there a quick and easy way to check this. I was trying using a reg exp
>if(/^[-0-9][\.0-9]*/) {
> do something
>}
>
>but this breaks when the number is say --75.4 It still accepts if it
>has two - signs.
$_ = 4.01;
if (/\D/) { print "has nondigits\n" }
if (/^\d+$/) { print "is a whole number\n" }
if (/^-?\d+$/) { print "is an integer\n" }
if (/^[+-]?\d+$/) { print "is a +/- integer\n" }
if (/^-?\d+\.?\d*$/) { print "is a real number\n" }
if (/^-?(?:\d+(?:\.\d*)?|\.\d+)$/) { print "is a decimal number\n" }
if (/^([+-]?)(?=\d|\.\d)\d*(\.\d*)?([Ee]([+-]?\d+))?$/)
{ print "a C float\n" }
°
Also check out the Regex::Common module, it has number-type detection.
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