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I would like to detect whether a user-chosen pin contains 4 identical numbers e.g 1111 or 2222. I’m using preg_match in PHP.
How can I adapt this answer to do this?
Adapting from the answer you link to:
Instead of using
\1+that would match any number of repetitions of the first digit, you substitute it with\1{3}that will only allow three repetitions of the first digit, thus giving you the desired four digits when matched.Or if you prefer: