in reply to Re^2: REgular expression to check the string that allows "a","b" and "c" to occur only once in any order.
in thread REgular expression to check the string that allows "a","b" and "c" to occur only once in any order.

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.
"Too many [] have been sedated by an oppressive environment of political correctness and risk aversion."
  • Comment on Re^3: REgular expression to check the string that allows "a","b" and "c" to occur only once in any order.

In Section Seekers of Perl Wisdom