Im using this ^[a-zA-Z0-9][a-zA-Z0-9]*([._-][a-zA-Z0-9]+){0,15}$
to validate username/pagenames
Im also showing specific error messages.
I have figured out most errors but these two
Pagenames may contain "." "_" or "-" but not consecutively
Pagenames can only contain Latin letters, numbers and "-", "_", "." but no other special characters
