Pattern to follow when Address Line1 starts with 3 same subsequent letters

Summary:

We have a requirement to validate Address Line1 if it starts with 3 same subsequent letters, then it must follow below pattern

a) field value may start with III (3 upper-case letter i), if fourth character is a dot and value length is > 4

b) or field value starts with "MMM-Str" (three times letter M, hyphen, upper-case s, lower-case t and r)

Tried the attached rule, getting error in expected pattern also.

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