Currently the validation of fullname looks like:
/^[a-zA-Z ]{2,30}$/
But that regexp validates only latin alphabet names. This should be changed in order to handle multilingual characters also. I have tried:
/^(\p{L}\p{M}*){2,30}$/u
But it validates numbers within names also, which is not correct.
As in the first case, use a character class with Unicode as well:
/^[\p{L}\p{M}\p{Zs}]{2,30}$/u
The \p{Zs} denotes a space char, such as regular space and Japanese space char ć.
In case you want to prevent space at the start and end, use these negative lookaheads:
/^(?!\p{Zs})(?!.*\p{Zs}$)[\p{L}\p{M}\p{Zs}]{2,30}$/u