Regex for MongoDB ObjectID

by

You can use following regular expression but it will not quite work

checkForHexRegExp = /^(?=[a-f\d]{24}$)(\d+[a-f]|[a-f]+\d)/i

Example:

> checkForHexRegExp.test("112345679065574883030833")
false
> checkForHexRegExp.test("FFFFFFFFFFFFFFFFFFFFFFFF")
false
> checkForHexRegExp.test("45cbc4a0e4123f6920000002")
true

But, as I commented, 112345679065574883030833, FFFFFFFFFFFFFFFFFFFFFFFF are also valid hexadecimal representations.

You should use /^[a-f\d]{24}$/i because it passes all the above tests

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