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right now the pattern ^(.{3}\.?){4}$ passes all the test case, but this violates the problem statement that the pattern needs to strictly follow a period after the first three charcters. for example "abcdefghijkl" passes the test, when it shouldn't.
short solution not violating this constraint can be something like ^...(\....){3}$ which enforces the \.
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I noticed a big flaw in the test case.
right now the pattern
^(.{3}\.?){4}$passes all the test case, but this violates the problem statement that the pattern needs to strictly follow a period after the first three charcters. for example "abcdefghijkl" passes the test, when it shouldn't.short solution not violating this constraint can be something like
^...(\....){3}$which enforces the\.