Regular expression for 4 to 30 only with even numbers only in Javascript

Asked Mar 12 '20 at 19:55

Active Mar 12 '20 at 19:55

Viewed 59 times

I am a fresher in Javascript, I want to write a regular expression for 4 to 30 and only even numbers. I have created a text field in Html and I want to validate based upon the regular expression.

I copied the following one, but it is not working for 4.

([12][02468])|([0][68])|([3][0])|(^[68])

This regular expression is not accepting 4 as number, it only accepts from 6. It should except 4 as minimum and other even numbers only, maximum value will be 30.

4, 6,8, 22, 26,24, 30 are allowed.

0, 1, 2, 3, 5, 31 21, 11 are not allowed.

Experts, help to solve this problem in Javascript.

asked Mar 12 '20 at 19:55

Deba

4

Why would you need a regex? – The fourth bird Mar 12 '20 at 19:55
Sir, it is written by some seniors, I need 4 to 30 numbers only. – Deba Mar 12 '20 at 19:58
4

@Deba If your seniors told you to use regex for this task and it's not some kind of a quiz or something, they don't know what they're talking about. That being said, if you have to use regex (for some weird reason), you may use something like `^(?:[468]|[12][02468]|30)$`. Demo: https://regex101.com/r/ztqLnW/1 – 41686d6564 stands w. Palestine Mar 12 '20 at 19:59
you mean to get regex for odd numbers between the range 4 - 30? – ROOT Mar 12 '20 at 20:00
1

Does this answer your question? [Regular Expression to match only odd or even number](https://stackoverflow.com/questions/691519/regular-expression-to-match-only-odd-or-even-number) – padaleiana Mar 12 '20 at 20:03
Yes Sir, I need regex for odd numbers between the range 4 - 30 – Deba Mar 12 '20 at 20:03
Ahmed Abdelhameed Sir, it is working. What is better way to achieve it so that I can talk to them as a junior. – Deba Mar 12 '20 at 20:09
@AhmedAbdelhameed Sir, thanks, your regular expression is working fine for me. – Deba Mar 12 '20 at 20:18
`([12][02468])|([0][68])|([3][0])|(^[468])`, it will also work as per your existing expression. – PythonLearner Mar 12 '20 at 21:43
1

let acceptable = (n) => 4<=n && n<=30 && !(n%2); – Chris Wesseling Mar 13 '20 at 12:27
@ChrisWesseling, Yes, I like this answer. – Deba Mar 13 '20 at 18:12

Regular expression for 4 to 30 only with even numbers only in Javascript

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