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That is simple!

A problem might arise if the desired letters could be part of a bigger string. Lacking any comments by isha on the specification :( so far, your solution is just as good.


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

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