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To convert regular expressions to NFA (Nondeterministic Finite Automaton), you can use Thompson's construction algorithm. This involves creating a series of NFA fragments based on the components of the regular expression and then combining them to form the final NFA.

For example, let's consider the regular expression (ab). Here's how you can convert it to an NFA using Thompson's construction:

  1. Create NFA fragments for 'a' and 'b'.
  2. Combine the 'a' and 'b' fragments using the union operation to create an NFA fragment for (ab).
  3. Create an NFA fragment for the Kleene closure () operation by adding epsilon transitions to allow for zero or more repetitions.
  4. Combine the (ab) fragment with the Kleene closure fragment to form the final NFA for (ab).

By following these steps and combining the NFA fragments accordingly, you can convert regular expressions to NFA.

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