How to convert NFA to regular expression stack overflow?

Here is an algorithm where each transition is incrementally replaced with a regex, until there is only an initial and final state: https://courses.engr.illinois.edu/cs373/sp2009/lectures/lect_08.pdf [PDF] Thanks for contributing an answer to Stack Overflow!
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https://stackoverflow.com/questions/9205778/how-to-convert-nfa-to-regular-expression
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