usability - User name form validation message -

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i have form validation message user name field says following

name can contain alphabets, '.' , ' ' characters

or should be

name can contain alphabets, dot , space characters

or should be

name can contain alphabets, dot (".") , space (" ") characters

which preferable usability perspective assuming end users has less exposure computers.

  • use 'letters of alphabet' not 'alphabets'
  • rather 'characters' ''.'' or ("."), why not show character on instance different background

so like:

name can contain letters of alphabet, . , spaces


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