Positive number validation in jquery

Question

I have used an expression for validating a positive number as follows:

^\d*\.{0,1}\d+$

when I give it an input of -23, it will mark input as negative, but when I give it an input of +23, it will mark it as invalid number!

what is the problem?

Can anyone give a solution that With +23 it will return (positive)?

not really a jquery question seems to be more about regex – Max Jan 08 '16 at 13:21 — Max, Jan 08 '16 at 13:21

Christian C. Salvadó · Accepted Answer · 2009-07-07T05:17:45.707

39

Have you considered to use anything beside regular expressions?

If you are using the jQuery Validation Plugin you could create a custom validation method using the Validator/addMethod function:

$.validator.addMethod('positiveNumber',
    function (value) { 
        return Number(value) > 0;
    }, 'Enter a positive number.');

Edit: Since you want only regular expressions, try this one:

^\+?[0-9]*\.?[0-9]+$

Explanation:

Begin of string (^)
Optional + sign (\+?)
The number integer part ([0-9]*)
An optional dot (\.?)
Optional floating point part ([0-9]+)
End of string ($)

edited Jul 07 '09 at 05:17

answered Jul 07 '09 at 04:52

Christian C. Salvadó

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thanks , my demand is in regular expression and will be striping white space – Nazmul Hasan Jul 07 '09 at 04:57
this also made me understand regex much better! – elad silver May 18 '15 at 10:49
@NazmulHasan '\s' stands for "whitespace character" just add it where you need – elad silver May 18 '15 at 10:50
If you are just looking for out of the box positive number validation, you can also look at the answers from user1052072 or Ali Chowdhury below. – Andreas Nov 08 '17 at 16:43

score 19 · Answer 2 · edited Oct 11 '12 at 07:45

19

Or simply use: min: 0.01.
For example for money

edited Oct 11 '12 at 07:45

Michael Schmidt

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answered Jul 04 '12 at 20:17

Massimo

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Like this answer not the best but the smarter!! – BlaShadow Dec 30 '15 at 14:44

score 3 · Answer 3 · answered Feb 20 '17 at 12:59

3

Easiest way is

$( "#myform" ).validate({
  rules: {
    field: {
      required: true,
      digits: true
    }
  }
});

ref : digits method | jQuery Validation Plugin --> https://jqueryvalidation.org/digits-method/

answered Feb 20 '17 at 12:59

Md. Nahidul Alam Chowdhury

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Also an excelent one, like the answer from user1052072 - it also works, if you just add the ```digits``` class to the input. – Andreas Nov 08 '17 at 16:41

score 1 · Answer 4 · answered May 13 '11 at 17:54

1

Since I'm looking for something similar, this will test for a positive, non-zero value with an optional leading plus (+) sign.

^\+?[1-9][0-9]*$

This does not match decimal places nor does it match leading zeros.

answered May 13 '11 at 17:54

amber

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score 0 · Answer 5 · answered Jul 07 '09 at 04:42

0

^\+?\d*.{0,1}\d+$

Gets you the ability to put a "+" in front of the number.

answered Jul 07 '09 at 04:42

Jeff Meatball Yang

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score 0 · Answer 6 · answered Jul 07 '09 at 04:59

0

If you insist on using a regular expression, please make sure that you also capture numbers with exponents and that you allow numbers of the form .42, which is the same as 0.42.

^+?\d*.?\d+([eE]+?\d+)?$

should to the trick.

answered Jul 07 '09 at 04:59

Martin Jansen

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it is not my question , my question about + or - as prefix and should avoid white space – Nazmul Hasan Jul 07 '09 at 05:03

score 0 · Answer 7 · answered Jul 07 '09 at 09:02

0

ok, try this;

\+?\d*\.?\d+\b

answered Jul 07 '09 at 09:02

Emre Erkan

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Positive number validation in jquery

7 Answers7