Backreferences
Matching Same Text Again & Again
([a-z]\w\s\W\d\D[A-Z][a-zA-Z][aeiouAEIOU]\S)\1Backreferences to Failed Groups
You have a test string S. Your task is to write a regex which will match S, with following condition(s):
S consists of 8 digits.
S may have "-" separator such that string S gets divided in 4 parts, with each part having exactly two digits. (Eg. 12-34-56-78)
^\d{2}(-?)\d{2}\1\d{2}\1\d{2}$Branch Reset Groups
^\d{2}(-(?:--)?|\.|:)\d{2}\1\d{2}\1\d{2}$Forward References
^(\2tic|(tac))+$Last updated
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