Regular expression for number with digit length limit including decimal

Question

I am having an issue while I am validating a textbox with number upto 11 digits including decimal and two digits after decimal(if any). On keyup in jquery.

I used this regular expression /^(\d+)?([.]?\d{0,2})?$/g to validate for a number and decimal with two digits, but I do not know how to constraint digits max to 11.

I have used the input type number with maxlength but it's not working.

Fiddle Is here

Html

<input type="number" />

jQuery

 $('input').keyup(function() {
        var $th = $(this);
        $th.val( $th.val().match(/^(\d+)?([.]?\d{0,2})?$/g, 
        function(str) { 
          return ''; }
          ) );
    });

Values like this

64123841.33 123456789.1 , 12345678901, 1.22,

Please Help me out with this.

Could you give some examples of valid and invalid values. For example, would `12345678901.11` be valid? — Rory McCrossan, Aug 17 '17 at 14:09
[*Some people, when confronted with a problem, think “I know, I'll use regular expressions.” Now they have two problems.* - Jamie Zawinski](http://regex.info/blog/2006-09-15/247) — , Aug 17 '17 at 14:23
So, you want to set a limit to the overall text length. Why not use [`maxlength="11"`](http://jsfiddle.net/tfqaj8zs/)? — Wiktor Stribiżew, Aug 17 '17 at 14:35
Dupe of [Limit number of characters allowed in form input text field](https://stackoverflow.com/questions/8545376/limit-number-of-characters-allowed-in-form-input-text-field). — Wiktor Stribiżew, Aug 17 '17 at 14:39
onkeyup is not appropriate. There are other ways to fill out forms. Autocomplete, drag&drop, paste. — Lee Kowalkowski, Aug 17 '17 at 15:08

Sahib Yar · Accepted Answer · 2017-08-17T15:05:36.977

4

^\d{0,8}\.\d{1,2}$|^\d{0,11}$

here is the working example

edited Aug 17 '17 at 15:05

answered Aug 17 '17 at 14:25

Sahib Yar

1,030
11
29

Look at your regex101 example again. Its not really matching as it should. It matches `3123123` as one match,`.` as one, and `22` as one. – Olian04 Aug 17 '17 at 14:27
@Olian04 now checking only once – Sahib Yar Aug 17 '17 at 14:51

score 1 · Answer 2 · answered Aug 17 '17 at 14:32

1

use a lookahead to test the length:

/^(?=.{1,11}$)\d+(?:\.\d{1,2})?$/

(?=.{1,11}$) is a lookahead that make sure we have 1 up to 11 character

(?:\.\d{1,2})? is an optional non capture group that allows 1 or 2 decimal

answered Aug 17 '17 at 14:32

Toto

89,455
62
89
125

1

Why not `maxlength="11"`? – Wiktor Stribiżew Aug 17 '17 at 14:38
@WiktorStribiżew: Because OP wants a regex. But, of course, attribute `maxlength="11"` is another solution. – Toto Aug 17 '17 at 14:50

Regular expression for number with digit length limit including decimal

2 Answers2