Username Patterns

Only lowercase letters and numbers; at least 5 characters, but no limit.  [a-zd.]{5,}

Source: html.com

Username Patterns

Only letters (either case), numbers, hyphens, underscores, and periods. (Not the slash character, that is being used to escape the period.) The username must start with a letter and must be between 1 and 20 characters long (inclusive).  [a-zA-Z][a-zA-Z0-9-_.]{1,20}

Source: html.com

Username Patterns

Only letters (either case), numbers, and the underscore; no more than 15 characters.  [A-Za-z0-9_]{1,15}

Source: html.com

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