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google search
Google search results:
1: https://www.sanfoundry.com/python-questions-answers-regular-expressions-3/
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2: https://www.sanfoundry.com/python-questions-answers-regular-expressions-4/
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3: https://onecompiler.com/python/3vfm7r39y
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4: https://stackoverflow.com/questions/42066352/python-regex-to-replace-all-single-word-characters-in-string/42066867
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5: https://onecompiler.com/c/3wg9x5uad
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6: https://www.sololearn.com/Discuss/2641835/solved-regular-expression-exercise-1-3/
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7: https://codeworld19.blogspot.com/2020/10/regex-substitution-in-python-hacker.html
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8: https://codeworld19.blogspot.com/2020/10/refindall-refinditer-in-python-hacker.html
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