Regex for multiples of 10

Question

I am not sure if this can be achieved via Regex Edit Alone. I need to validate a integer field value for multiples of 10 in my MVC View. Is this achievable via regex alone and unobstrusive validation?

@DavidSchwartz sometimes answer is right in front of youand is simple :) — Flood Gravemind, Aug 27 '13 at 22:14
Why don't use the module? 5%10 != 0 and 50%10 == 0 son any multiple of ten will allways have module 0 — Gonzix, Aug 27 '13 at 22:16

p.s.w.g · Accepted Answer · 2015-07-09T22:16:08.663

A pattern like this should work:

^[0-9]*0$

Of course this will allow 0. If you'd like to ensure that the input is greater than or equal to 10, you can use this:

^[1-9][0-9]*0$

However, this won't handle numbers expressed in different numeral systems (e.g. ۱۰, which I believe is 10 in Eastern Arabic numerals). It would be better to create a custom validation attribute to test the value of the input. A simple implementation would look a bit like this:

public class MultipleOf10Attribute : ValidationAttribute
{
    public override bool IsValid(object value)
    {
        return ((int)value) % 10 == 0;
    }
}

score 3 · Answer 2 · edited May 23 '17 at 10:26

3

Hmm. It's my understanding that multiples of 10 end in 0. Always. (At least in decimal.) So how about

^.*0$

or if you want to make sure they're all decimal:

^\d*0$

simple, unless I'm missing something.

As per the comments, matching negative numbers:

^-?\d*0$

For a more generalized (and totally useless) approach, check out: Check number divisibility with regular expressions

And a cool way to check for primes, again useless here

edited May 23 '17 at 10:26

Community

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answered Aug 27 '13 at 22:12

vroomfondel

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`asdasdas0` matches that regex – Blorgbeard Aug 27 '13 at 22:12
This will not match negative numbers. – Femaref Aug 27 '13 at 22:13
@Blorgbeard, thanks for the tip -- I assumed "integer field" meant that all input would be integral. – vroomfondel Aug 27 '13 at 22:16
@rogaos you may be right actually, doesn't hurt to make the regex clearer though :) – Blorgbeard Aug 28 '13 at 00:28

score 0 · Answer 3 · answered Aug 27 '13 at 22:15

0

yes you can do that here is the regex for multiple of 10

^\d*\d?((10)|(0))\.?((0)|(00))?$

answered Aug 27 '13 at 22:15

Tushar Gupta

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That seems like a complicated way of doing it.. also OP says "integer field", and you appear to be allowing decimals – Blorgbeard Aug 28 '13 at 00:29

Regex for multiples of 10

3 Answers3