regular expression for numbers

[baskarpr]

I am new to regular expression. I have to validate an input, such as that should be non-negative numeric value (case 1) and non-negative numeric decimal value (case 2) (i.e. 0.5, 0.2, 10.0 etc) . I have tried out like below.

   var reg2 =   /^\d*\.{0,1}\d+$/;
   if(!reg2.test(str)) {
        alert("Not valid");
   }

1. Is this enough to check for non negative numbers ?
2. How can I check for non negative decimal values ?

[acoder]

At the moment, your regular expression checks for:

1. 0 or more digits (0-9)
2. followed by 0 or 1 dots (there may not be a dot)
3. followed by 1 or more digits

So, it would match 0, 5, 0.2, .4, 5.5, etc.

[pbmods]

Heya, baskarpr.

Checking for a non-negative is easy:

val = parseFloat(str);
if(val < 0)
{
    alert('Must not be negative.');
}
 

To check to make sure it has a decimal value, simply do this:

if(val == parseInt(val))
{
    alert('Must have a decimal part.');
}
 

[baskarpr]

I am new to regular expression. I have to validate an input, such as that should be non-negative numeric value (case 1) and non-negative numeric decimal value (case 2) (i.e. 0.5, 0.2, 10.0 etc) . I have tried out like below.

var reg2 =   /^\d*\.{0,1}\d+$/;
   if(!reg2.test(str)) {
        alert("Not valid");
   }

1. Is this enough to check for non negative numbers ?
2. How can I check for non negative decimal values ?

[baskarpr]

Heya, baskarpr.

Checking for a non-negative is easy:

val = parseFloat(str);
if(val < 0)
{
    alert('Must not be negative.');
}
 

To check to make sure it has a decimal value, simply do this:

if(val == parseInt(val))
{
    alert('Must have a decimal part.');
}
 

I have tried with "< 0 " for negative numbers. But just I wanted to do that check in regular expression fo uniformity. Now I found it. Thanks to every one replied. :-)

[pbmods]

Heya, baskarpr.

Glad to hear you got it working! Good luck with your project, and if you ever need anything, post back anytime :)

[pbmods]

Merged duplicate threads.

[baskarpr]

Merged duplicate threads.

hi, pbmods.. thanks for reply... Actually when i submitted and came back, I cant find my post. So I posted again. seems to be a bug... :-)

[pbmods]

Heya, Baskarpr.

Actually when i submitted and came back, I cant find my post.

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