Yup with regex - How to validate that a string is NOT a specific word (not case sensitive)

Question

I'm using YUP in order to validate some fields in my form (formik for React).

one of those fields is a user name the user needs to choose.

I want the ability to mark some special words as not valid, using regex.

for example, the word "admin" (or "Admin" or any other combination of it) is not allowed

according to YUP documentation:

but the example shows only a list of valid word, not invalid word

i tried:

userName: Yup.string().matches(/^(Admin|admin)/, 'admin is not a valid user name').required('Required'),

but even this simple regext is not working

so, how to write a regex that negates a word (preferably with all the case combinations)?

thanks!

Lutfi Creativesys Lutfi Creativesys · Accepted Answer · 2020-11-08T10:58:14

0

votes

You can use this pattern :

/[A|a]dmin/ig