R E G E X_ U S E R N A M E
Regex of username.
scope for "a-z", "A-Z", "0-9", "_", "Chinese character"
can't end with "_"
length is between 6 to 20
Regex of username.
scope for "a-z", "A-Z", "0-9", "_", "Chinese character"
can't end with "_"
length is between 6 to 20