The username may only consist of characters and numbers and must start with a character.//英语翻译

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The username may only consist of characters and numbers and must start with a character.//英语翻译

The username may only consist of characters and numbers and must start with a character.//英语翻译
The username may only consist of characters and numbers and must start with a character.//英语翻译

The username may only consist of characters and numbers and must start with a character.//英语翻译
用户名只能用字母与数字组成,而且必须得以字母开头

用户名只能是字母和数字组合,必须从一个字母开头

用户名可以仅仅由字母和数字组成,但是必须以字母开头

用户名只能包含字母和数字,并以字母开头

用户名只能包含字母和数字,必须启动一个字符。