Question: Find regular expressions that define the following languages: All strings over the alphabet {a,b} that start and end with the substring bab . All strings

Find regular expressions that define the following languages:

  1. All strings over the alphabet {a,b} that start and end with the substring bab.
  2. All strings over the alphabet {a, b} that do not contain the substring aaa.
  3. All strings over the alphabet {a, b, c} for which the number of "a" is a multiple of 3 (including zero).
  4. All strings over the alphabet {a, b} that do not contain the substring aab and end with bb.

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