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Agreed, for the simple case, but it trivially extends to any number of unqiue characters within strings of a specified length. (Think crossword, hangman etc. :) Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
"Science is about questioning the status quo. Questioning authority".
In the absence of evidence, opinion is indistinguishable from prejudice.
In reply to Re^3: REgular expression to check the string that allows "a","b" and "c" to occur only once in any order.
by BrowserUk
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