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$Regex_Pattern = '/^tac((tac)+\2|tac(tic))*$/';
A better pattern by @roshankumar350:
$Regex_Pattern = '/^(\2tic|(tac))+$/';
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$Regex_Pattern = '/^tac((tac)+\2|tac(tic))*$/';
A better pattern by @roshankumar350:
$Regex_Pattern = '/^(\2tic|(tac))+$/';