A FIO Address consists of a username and a domain delimited by an @ symbol, there are not specific requirements around a FIO Address username, but there are format restrictions around the FIO Address as a whole, and then separate requirements for a FIO Domain in particular.
|FIO Address ([email protected])||FIO Domain|
|Max Chars||64 (including FIO Domain)||62|
|Characters allowed||ASCII a-z 0-9 - (dash) with single @ (at sign)||ASCII a-z 0-9 - (dash)|
FIO Address validation using regex
Regex validation may be used. For example, the following regex may be used to validate a FIO Address: