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Changes look good. Do you know what the regular expression .*\S.* mean and how it rejects a string containing only space characters?

Hi cjyuan, thank you for the additional question. Upon doing some research I found that this is a regex expression which helps to describe what patterns of text are allowed/disallowed. I understand that the "." matches any single character, the "*" means any characters, length or nothing, the "\S" means any non-whitespace character - so the rule becomes - whatever input the user enters must contain at least one non-whitespace character somewhere. I then tested this solution using devtools console to see if I only entered " ", what would happen - this failed as it does not contain a non-space character, the second test was "Ka" - this passes and finally " K " also passes as it satisfies the rule.