checking if its a real number

[T. Murlidharan Nair]

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.

Thanks for your help.
Cheers always!!
Murli


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