I have a question: How to search a string using a basic regular expression in Vi editor? How about using extended regular expression in Vi editor?. Is it a real difference between basic regular expression and extended regular expression? They have different syntaxes but the algorithm is the same. What is the logically correct answer for this question?
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:help regexp
for detailed information that should answer your question and then some. (Note, your question is too "fuzzy", and so I won't even try to give a full answer.) – Karl Yngve Lervåg Feb 18 at 7:47