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4

Regex for MongoDB ObjectID

rated 0 times [ 5] [ 1] / answers: 1 / hits: 49488 / 11 Years ago, wed, january 8, 2014, 12:00:00

With reference to this SO question, I have a scenario where I only need to match a hex string with a-f included. All else should not match. Example:

checkForHexRegExp.test(112345679065574883030833); // => false

checkForHexRegExp.test(FFFFFFFFFFFFFFFFFFFFFFFF); // => false

checkForHexRegExp.test(45cbc4a0e4123f6920000002); // => true

My use case is that I am working with a set of hex strings and would like to only validate as true those that are mongodb objectIDs.

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grayson

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answered 11 Years ago arturo · Accepted Answer

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

checkForHexRegExp = /^(?=[a-fd]{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-fd]{24}$/i because it passes all the above tests