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Let u and v be two particular strings over an alphabet Σ. Prove that the following...

Let u and v be two particular strings over an alphabet Σ.

Prove that the following language B = {w ∈ Σ ∗ | w contains u as a substring but does not contain v as a substring} is regular.

As a hint, think of using operations under which regular languages are known to be closed to simplify your argument.

plz provide with the full detail !

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