How to write a regex (JavaScript) for an id validation?

Question

Basically my validation is very simple, but I'm totally new to regex and need this fired up fairly quickly, so here goes: 1234567890 or 123456-7890 it can be, obviously, any number in a range of 0 - 9 and the length must be either 10 or 11 characters.

Can you please show me a way to write a function for this?

see this stack overflow post http://stackoverflow.com/questions/4840547/javascript-regular-expression-to-match-x-digits-only — Sachin Gupta, Apr 01 '15 at 06:15

lshettyl · Answer 1 · 2015-04-01T09:40:50.127

2

It's hard to post using an iPhone, but, here it goes:

/^\d{6}-?\d{4}$/

^ - starts with
$ - ends with
\d{6} - match 6 digits
? - something is optional, in this case -
\d{4} - match 4 digits

So, the above would match 123456-7890 and 1234567890

edited Apr 01 '15 at 09:40

answered Apr 01 '15 at 06:19

lshettyl

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score 1 · Accepted Answer · answered Apr 01 '15 at 06:23

1

function isId(id) {
    return /^\d{6}-?\d{4}$/.test(id);
}

isId("1234567890"); // true
isId("123456-7890"); // true

answered Apr 01 '15 at 06:23

Timur Osadchiy

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Thank you! This works perfectly :) – Xeen Apr 01 '15 at 06:26
Always welcome @Xeen! – Timur Osadchiy Apr 01 '15 at 06:27
@Xeen, due note however that you might want to limit \d to [0-9] instead to prevent other number formats. Is it to validate Danish Social Security Numbers? – Johny Skovdal Apr 03 '15 at 16:25

score 0 · Answer 3 · answered Apr 01 '15 at 06:24

0

If the dashes should be possible at any position:

function test_id(id) {return /^\d{10,11}$/.test(id.replace(/-/g, ''));}

Output:

test_id('123')
> false
test_id('2')
> false
test_id('223-345-123-12')
> true
test_id('223-345-12312')
> true

answered Apr 01 '15 at 06:24

Oleg K.

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This would be nearly perfect, but a dash can be only after 6th number – Xeen Apr 01 '15 at 06:25

How to write a regex (JavaScript) for an id validation?

3 Answers3