How create username with alpha numeric characters

please let me know how create username with this condition “the username can contain only lower-case alphanumeric characters, underscores, and hyphens, and must begin and end with an alphanumeric character.”

Hi @ems

What software and version are you using? Are you asking how to create an username with alpha numeric characters, but it is not clear what you really want to do?

Regards,
Israel Cefrin
Public Knowledge Project Team