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1. * and + behaving differently in regex
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2. error in regex pattern matching for text retrieval into two columns of a dataframe
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3. I can't find a regex that will delete a group of lines where the starting and ending lines contain curly braces
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4. Regex: matching for digits excluding some digits at a position
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5. How do I create a regex expression that does not allow the same 9 duplicate numbers in a social security number, with or without hyphens?
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