javascript - regex for only lowercase letters and underscore

Question

I'm trying to validate a field called "role" where the pattern's type is only names like this: super_user, computer_group. But not this: "admin_area_" or "Admin_area??", "ADMIN_". Only lowercase letters and underscore between those letters, never on final. This is what i tried until now:

/^[a-z]+(_*[a-z]+)*$/ and /^[a-z_]*$/

But for some reason, when the user types "??" or any other character my validation is still allowing those characters.

NOTE: my inputs are from quasar framework where I validate that in :rules

question from:https://stackoverflow.com/questions/65848595/regex-for-only-lowercase-letters-and-underscore

Answer 1

your first regex is working well still you can try this one. it won't allow without underscore.

^[a-z]+_[a-z]+$