Help me to build a regex. I want to validate the string against the duplicate occurence of the groups in the string. Number of members in group is 3. Members in the group can occur in any order. All members of the given group must be different. Every character is part of some or other group.

Some examples:
"abcdbca" => not a valid string (same groups: "abc" and "bca")
"abcba" => not a valid string (same groups: "abc" and "cba")
"abcdabe" =>a valid string

Thanks.

In reply to Regex Help : Group in Strings by artist

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