The username may only consist of characters and numbers and must start with a character.(翻译)

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Theusernamemayonlyconsistofcharactersandnumbersandmuststartwithacharacter.(翻译)Theusernamemayonlycons

The username may only consist of characters and numbers and must start with a character.(翻译)
The username may only consist of characters and numbers and must start with a character.(翻译)

The username may only consist of characters and numbers and must start with a character.(翻译)
用户名只能包含子母河数字,且需要以字母开头.

用户名可能只包含文字和数字,必须从一个角色

用户名只允许包括字母及数字并且必须以字母来开头。

用户名可以包含字母和数字但必须一字母开头