User name form validation message

Posted by Samuel on Stack Overflow See other posts from Stack Overflow or by Samuel
Published on 2010-04-28T09:17:58Z Indexed on 2010/04/28 9:23 UTC
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I have a form validation message for the user name field which says the following

Name can only contain alphabets, '.' and ' ' characters

OR should it be

Name can only contain alphabets, dot and space characters

OR should it be

Name can only contain alphabets, dot (".") and space (" ") characters

Which is preferable from a usability perspective assuming the end users has very less exposure to computers.

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