RegEx to identify guid or a number

Question

I have regex for guid:

/^[0-9a-f]{8}-[0-9a-f]{4}-[1-5][0-9a-f]{3}-[89ab][0-9a-f]{3}-[0-9a-f]{12}$/i

And regex to match a number:

/^[0-9]*$

But I need to match either a guid or a number. Is there a way to do it matching a single regex. Or should I check for guid and number separately.

score 3 · Accepted Answer · answered Apr 20 '18 at 04:42

Use | in a regular expression to match either what comes before or what comes after:

const re = /^([0-9a-f]{8}-[0-9a-f]{4}-[1-5][0-9a-f]{3}-[89ab][0-9a-f]{3}-[0-9a-f]{12})|[0-9]+$/i;
console.log('11111111-1111-1111-8111-111111111111'.match(re)[0]);
console.log('5555'.match(re)[0]);

score 2 · Answer 2 · answered Apr 20 '18 at 04:42

2

You can use | operator between two regex expressions. You can use them as given below

/(^[0-9a-f]{8}-[0-9a-f]{4}-[1-5][0-9a-f]{3}-[89ab][0-9a-f]{3}-[0-9a-f]{12}$/i) | (^[0-9]*$)/

answered Apr 20 '18 at 04:42

Rajat

71
5

Positioning of brackets seem to be wrong between the two OR conditions. – Gabriela Jennifer Apr 20 '18 at 05:02

score 0 · Answer 3 · answered Apr 20 '18 at 04:40

Yes, there are many ways for this. One is to OR the matches in an if statement:

var reg1 = /^[0-9a-f]{8}-[0-9a-f]{4}-[1-5][0-9a-f]{3}-[89ab][0-9a-f]{3}-[0-9a-f]{12}$/i;
var reg2 = /^[0-9]*$/;
var text = " ... ";

if (reg1.test(text) || reg2.test(text)) {
  // do your stuff here
}

Another approach is ORing in the RegExp itself:

var regex = /(^[0-9]*)|^[0-9a-f]{8}-[0-9a-f]{4}-[1-5][0-9a-f]{3}-[89ab][0-9a-f]{3}-[0-9a-f]{12}$/i;
var text = " ... ";

if (regex.test(text)) {
  // do your stuff here
}

RegEx to identify guid or a number

3 Answers3